diff --git a/core/misc/cspell/dictionary.txt b/core/misc/cspell/dictionary.txt
index 9687daecb44d264a74c9dad3b3c70f84e2378cf7..afab74c8ae68619ea4b5c7f820b9687d61a12299 100644
--- a/core/misc/cspell/dictionary.txt
+++ b/core/misc/cspell/dictionary.txt
@@ -114,6 +114,7 @@ checkboxifier
 checkboxify
 checkboxradio
 chocolatiers
+chotchkies
 chromedriver
 chtext
 chumillas
@@ -312,6 +313,7 @@ imagecache
 imagetextalternative
 indexname
 inited
+initech
 inno
 instantiator
 interactable
@@ -365,6 +367,7 @@ loquesea
 lrdd
 lstitle
 ltitle
+lumbergh
 lzma
 mainpage
 mank
@@ -788,6 +791,7 @@ versionless
 vfsstream
 viewports
 vocabs
+waddams
 wcag
 wcprops
 webassert
diff --git a/core/modules/layout_builder/config/schema/layout_builder.schema.yml b/core/modules/layout_builder/config/schema/layout_builder.schema.yml
index 0bab48dfbb5e6492fc2233d43a8e8e1e4c8626c5..c2276ded4eff10d4afc1a15271f3f3e04d596203 100644
--- a/core/modules/layout_builder/config/schema/layout_builder.schema.yml
+++ b/core/modules/layout_builder/config/schema/layout_builder.schema.yml
@@ -56,6 +56,11 @@ layout_builder.component:
     additional:
       type: ignore
       label: 'Additional data'
+    third_party_settings:
+      type: sequence
+      label: 'Third party settings'
+      sequence:
+        type: '[%parent.%parent.%type].third_party.[%key]'
 
 inline_block:
   type: block_settings
diff --git a/core/modules/layout_builder/layout_builder.post_update.php b/core/modules/layout_builder/layout_builder.post_update.php
index ee735bf41b85b038aba945d3dbf8dd336ab0bbef..3741c3139b5b55695ccc3141490525a4a484e166 100644
--- a/core/modules/layout_builder/layout_builder.post_update.php
+++ b/core/modules/layout_builder/layout_builder.post_update.php
@@ -9,6 +9,7 @@
 use Drupal\Core\Entity\Display\EntityViewDisplayInterface;
 use Drupal\Core\Field\Plugin\Field\FieldFormatter\TimestampFormatter;
 use Drupal\layout_builder\Entity\LayoutEntityDisplayInterface;
+use Drupal\layout_builder\SectionComponent;
 
 /**
  * Implements hook_removed_post_updates().
@@ -76,3 +77,45 @@ function layout_builder_post_update_timestamp_formatter(?array &$sandbox = NULL)
 function layout_builder_post_update_enable_expose_field_block_feature_flag(): void {
   \Drupal::service('module_installer')->install(['layout_builder_expose_all_field_blocks']);
 }
+
+/**
+ * Add third_party_settings key to all section components.
+ */
+function layout_builder_post_update_section_component_third_party(?array &$sandbox = NULL): void {
+  $config_entity_updater = \Drupal::classResolver(ConfigEntityUpdater::class);
+
+  $callback = function (EntityViewDisplayInterface $display) {
+    $needs_update = FALSE;
+
+    // Only update entity view displays where Layout Builder is enabled.
+    if ($display instanceof LayoutEntityDisplayInterface && $display->isLayoutBuilderEnabled()) {
+      foreach ($display->getSections() as $section) {
+        // Add a third_party_settings element to each section component.
+        $components = $section->getComponents();
+        foreach ($components as $delta => $component) {
+          $components[$delta] = new SectionComponent(
+            $component->getUuid(),
+            $component->getRegion(),
+            $component->getConfiguration(),
+            $component->toArray()['additional']
+          );
+          // Depending on the state of the configuration of a site and when this
+          // update is run, there might already be third party settings on a
+          // section component. Retain them, if they exist.
+          $tps_providers = $component->getThirdPartyProviders();
+          foreach ($tps_providers as $provider) {
+            foreach ($component->getThirdPartySettings($provider) as $key => $value) {
+              $component->setThirdPartySetting($provider, $key, $value);
+            }
+          }
+          // Flag this display as needing to be updated.
+          $needs_update = TRUE;
+        }
+      }
+    }
+
+    return $needs_update;
+  };
+
+  $config_entity_updater->update($sandbox, 'entity_view_display', $callback);
+}
diff --git a/core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplay.php b/core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplay.php
index 6e058878bfae291b07216181098b0dc075f6fb48..bfad0a431fa15543bcb36c06d85362ccc49e1530 100644
--- a/core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplay.php
+++ b/core/modules/layout_builder/src/Entity/LayoutBuilderEntityViewDisplay.php
@@ -451,7 +451,7 @@ public function setComponent($name, array $options = []) {
 
       $section = $this->getDefaultSection();
       $region = $options['region'] ?? $section->getDefaultRegion();
-      $new_component = (new SectionComponent(\Drupal::service('uuid')->generate(), $region, $configuration));
+      $new_component = new SectionComponent(\Drupal::service('uuid')->generate(), $region, $configuration);
       $section->appendComponent($new_component);
     }
     return $this;
diff --git a/core/modules/layout_builder/src/SectionComponent.php b/core/modules/layout_builder/src/SectionComponent.php
index b0f8ff13e4f3a8a6257411af2cffd78cb394d7c9..275759961f76e8ba657515cf7bbf0910eeda93a4 100644
--- a/core/modules/layout_builder/src/SectionComponent.php
+++ b/core/modules/layout_builder/src/SectionComponent.php
@@ -3,6 +3,7 @@
 namespace Drupal\layout_builder;
 
 use Drupal\Component\Plugin\Exception\PluginException;
+use Drupal\Core\Config\Entity\ThirdPartySettingsInterface;
 use Drupal\Core\Plugin\ContextAwarePluginInterface;
 use Drupal\layout_builder\Event\SectionComponentBuildRenderArrayEvent;
 
@@ -18,7 +19,7 @@
  * @see \Drupal\layout_builder\Section
  * @see \Drupal\layout_builder\SectionStorageInterface
  */
-class SectionComponent {
+class SectionComponent implements ThirdPartySettingsInterface {
 
   /**
    * The UUID of the component.
@@ -52,9 +53,30 @@ class SectionComponent {
    * Any additional properties and values.
    *
    * @var mixed[]
+   *
+   * @deprecated in drupal:10.2.0 and is removed from drupal:11.0.0.
+   * Additional component properties should be set via ::setThirdPartySetting().
+   *
+   * @see https://www.drupal.org/node/3100177
    */
   protected $additional = [];
 
+  /**
+   * Third party settings.
+   *
+   * An array of key/value pairs keyed by provider.
+   *
+   * @var mixed[]
+   */
+  protected $thirdPartySettings = [];
+
+  /**
+   * The legacy additional module key created dinamically.
+   *
+   * @var mixed
+   */
+  protected $legacyAdditionalModuleKey;
+
   /**
    * Constructs a new SectionComponent.
    *
@@ -65,13 +87,24 @@ class SectionComponent {
    * @param mixed[] $configuration
    *   The plugin configuration.
    * @param mixed[] $additional
-   *   An additional values.
+   *   (optional) Additional values.
+   * @param array[] $third_party_settings
+   *   (optional) Any third party settings.
+   *
+   * @todo Remove $additional argument in
+   *   https://www.drupal.org/project/drupal/issues/3160644 in drupal:11.0.x.
    */
-  public function __construct($uuid, $region, array $configuration = [], array $additional = []) {
+  public function __construct($uuid, $region, array $configuration = [], array $additional = [], array $third_party_settings = []) {
     $this->uuid = $uuid;
     $this->region = $region;
     $this->configuration = $configuration;
+    // @todo Remove below $additional code when the drupal:11.0.x branch is opened.
+    // @see https://www.drupal.org/project/drupal/issues/3160644
     $this->additional = $additional;
+    if ($additional !== []) {
+      @trigger_error('Setting additional properties is deprecated in drupal:10.2.0 and is removed from drupal:11.0.0. Additional component properties should be set via ::setThirdPartySetting(). See https://www.drupal.org/node/3100177', E_USER_DEPRECATED);
+    }
+    $this->thirdPartySettings = $third_party_settings;
   }
 
   /**
@@ -99,6 +132,11 @@ public function toRenderArray(array $contexts = [], $in_preview = FALSE) {
    * @param string $property
    *   The property to retrieve.
    *
+   * @deprecated in drupal:10.2.0 and is removed from drupal:11.0.0.
+   * Additional properties should be gotten via ::getThirdPartySetting().
+   *
+   * @see https://www.drupal.org/node/3100177
+   *
    * @return mixed
    *   The value for that property, or NULL if the property does not exist.
    */
@@ -109,6 +147,7 @@ public function get($property) {
     else {
       $value = $this->additional[$property] ?? NULL;
     }
+    @trigger_error('Getting additional properties is deprecated in drupal:10.2.0 and is removed from drupal:11.0.0. Additional component properties should be gotten via ::getThirdPartySetting(). See https://www.drupal.org/node/3100177', E_USER_DEPRECATED);
     return $value;
   }
 
@@ -120,6 +159,11 @@ public function get($property) {
    * @param mixed $value
    *   The value to set.
    *
+   * @deprecated in drupal:10.2.0 and is removed from drupal:11.0.0.
+   * Additional properties should be set via ::setThirdPartySetting().
+   *
+   * @see https://www.drupal.org/node/3100177
+   *
    * @return $this
    */
   public function set($property, $value) {
@@ -129,6 +173,7 @@ public function set($property, $value) {
     else {
       $this->additional[$property] = $value;
     }
+    @trigger_error('Setting random section component properties is deprecated in drupal:10.2.0 and is removed from drupal:11.0.0. Component properties should be set via dedicated setters. See https://www.drupal.org/node/3100177', E_USER_DEPRECATED);
     return $this;
   }
 
@@ -187,7 +232,7 @@ public function setWeight($weight) {
    * @return mixed[]
    *   The component plugin configuration.
    */
-  protected function getConfiguration() {
+  public function getConfiguration() {
     return $this->configuration;
   }
 
@@ -293,7 +338,10 @@ public function toArray() {
       'region' => $this->getRegion(),
       'configuration' => $this->getConfiguration(),
       'weight' => $this->getWeight(),
+      // @todo Remove below key/value when the drupal:11.0.x branch is opened.
+      // @see https://www.drupal.org/project/drupal/issues/3160644
       'additional' => $this->additional,
+      'third_party_settings' => $this->thirdPartySettings,
     ];
   }
 
@@ -309,12 +357,70 @@ public function toArray() {
    *   The section component object.
    */
   public static function fromArray(array $component) {
+    // Ensure expected array keys are present.
+    $component += [
+      'uuid' => '',
+      'region' => '',
+      'configuration' => [],
+      // @todo Remove below key/value when the drupal:11.0.x branch is opened.
+      // @see https://www.drupal.org/project/drupal/issues/3160644
+      'additional' => [],
+      'third_party_settings' => [],
+    ];
     return (new static(
       $component['uuid'],
       $component['region'],
       $component['configuration'],
-      $component['additional']
+      // @todo Remove below argument when the drupal:11.0.x branch is opened.
+      // @see https://www.drupal.org/project/drupal/issues/3160644
+      $component['additional'],
+      $component['third_party_settings']
     ))->setWeight($component['weight']);
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getThirdPartySetting($provider, $key, $default = NULL) {
+    return $this->thirdPartySettings[$provider][$key] ?? $default;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getThirdPartySettings($provider) {
+    return $this->thirdPartySettings[$provider] ?? [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setThirdPartySetting($provider, $key, $value) {
+    $this->thirdPartySettings[$provider][$key] = $value;
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function unsetThirdPartySetting($provider, $key) {
+    unset($this->thirdPartySettings[$provider][$key]);
+    // If the third party is no longer storing any information, completely
+    // remove the array holding the settings for this provider.
+    if (empty($this->thirdPartySettings[$provider])) {
+      unset($this->thirdPartySettings[$provider]);
+    }
+    return $this;
+  }
+
+  /**
+   * Gets the list of third parties that store information.
+   *
+   * @return array
+   *   The list of third parties.
+   */
+  public function getThirdPartyProviders() {
+    return array_keys($this->thirdPartySettings);
+  }
+
 }
diff --git a/core/modules/layout_builder/tests/modules/layout_builder_defaults_test/config/install/core.entity_view_display.entity_test.bundle_with_extra_fields.default.yml b/core/modules/layout_builder/tests/modules/layout_builder_defaults_test/config/install/core.entity_view_display.entity_test.bundle_with_extra_fields.default.yml
index 069aa0341957a62481f7451a2204223fe9ccabef..2474784e12fa2c2432d1aee2629f46933d7c8302 100644
--- a/core/modules/layout_builder/tests/modules/layout_builder_defaults_test/config/install/core.entity_view_display.entity_test.bundle_with_extra_fields.default.yml
+++ b/core/modules/layout_builder/tests/modules/layout_builder_defaults_test/config/install/core.entity_view_display.entity_test.bundle_with_extra_fields.default.yml
@@ -23,6 +23,7 @@ third_party_settings:
                 entity: layout_builder.entity
             weight: 1
             additional: {  }
+            third_party_settings: {  }
 id: entity_test.bundle_with_extra_fields.default
 targetEntityType: entity_test
 bundle: bundle_with_extra_fields
diff --git a/core/modules/layout_builder/tests/modules/layout_builder_defaults_test/config/schema/layout_builder_defaults_test.schema.yml b/core/modules/layout_builder/tests/modules/layout_builder_defaults_test/config/schema/layout_builder_defaults_test.schema.yml
index cd7d1515260321665c6a5e5808555e7784d25934..f270995dd24913df7f52fcd62d24f40fb3b79796 100644
--- a/core/modules/layout_builder/tests/modules/layout_builder_defaults_test/config/schema/layout_builder_defaults_test.schema.yml
+++ b/core/modules/layout_builder/tests/modules/layout_builder_defaults_test/config/schema/layout_builder_defaults_test.schema.yml
@@ -4,3 +4,9 @@ layout_builder.section.third_party.layout_builder_defaults_test:
     which_party:
       label: 'Which party?'
       type: string
+layout_builder.component.third_party.layout_builder_defaults_test:
+  type: mapping
+  mapping:
+    harold:
+      type: string
+      label: Some arbitrary string.
diff --git a/core/modules/layout_builder/tests/src/Kernel/DefaultsSectionStorageTest.php b/core/modules/layout_builder/tests/src/Kernel/DefaultsSectionStorageTest.php
index 00055e4080b0d3dc1edb3fbe0f631f06ffd62f7d..773a69377714e563f66ecfc5fcd22887f1c9dd88 100644
--- a/core/modules/layout_builder/tests/src/Kernel/DefaultsSectionStorageTest.php
+++ b/core/modules/layout_builder/tests/src/Kernel/DefaultsSectionStorageTest.php
@@ -117,7 +117,7 @@ public static function providerTestAccess() {
         'layout_onecol',
         [],
         [
-          '10000000-0000-1000-a000-000000000000' => new SectionComponent('10000000-0000-1000-a000-000000000000', 'content', ['id' => 'foo'], ['harold' => 'maude']),
+          '10000000-0000-1000-a000-000000000000' => new SectionComponent('10000000-0000-1000-a000-000000000000', 'content', ['id' => 'foo'], [], ['layout_builder_defaults_test' => ['harold' => 'maude']]),
         ],
         ['layout_builder_defaults_test' => ['which_party' => 'third']]
       ),
diff --git a/core/modules/layout_builder/tests/src/Unit/SectionComponentTest.php b/core/modules/layout_builder/tests/src/Unit/SectionComponentTest.php
index 0561034479ec6705f7a1d58be4edb14b59edce84..cb99525091657b97bb774f56829275a6e638ef8b 100644
--- a/core/modules/layout_builder/tests/src/Unit/SectionComponentTest.php
+++ b/core/modules/layout_builder/tests/src/Unit/SectionComponentTest.php
@@ -11,6 +11,7 @@
 use Drupal\Core\Layout\LayoutPluginManagerInterface;
 use Drupal\layout_builder\Event\SectionComponentBuildRenderArrayEvent;
 use Drupal\layout_builder\LayoutBuilderEvents;
+use Drupal\layout_builder\Section;
 use Drupal\layout_builder\SectionComponent;
 use Drupal\Tests\UnitTestCase;
 use Prophecy\Argument;
@@ -22,6 +23,38 @@
  */
 class SectionComponentTest extends UnitTestCase {
 
+  /**
+   * The section object to test.
+   *
+   * @var \Drupal\layout_builder\Section
+   */
+  protected $section;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp(): void {
+    parent::setUp();
+
+    $component = new SectionComponent(
+      'some-uuid',
+      'some-region',
+      ['id' => 'existing-block-id'],
+      [],
+      [
+        'Initech' => [
+          'Bill Lumbergh' => 'TPS reports',
+          'Milton Waddams' => 'Red Stapler',
+        ],
+        'Chotchkies' => [
+          'flair' => TRUE,
+        ],
+      ]
+    );
+
+    $this->section = new Section('layout_onecol', [], [$component]);
+  }
+
   /**
    * @covers ::toRenderArray
    */
@@ -70,4 +103,227 @@ public function testToRenderArray(): void {
     $this->assertEquals($expected, $result);
   }
 
+  /**
+   * @covers ::getThirdPartySettings
+   * @dataProvider providerTestGetThirdPartySettings
+   */
+  public function testGetThirdPartySettings($provider, $expected): void {
+    $this->assertSame($expected, $this->section->getComponent('some-uuid')->getThirdPartySettings($provider));
+  }
+
+  /**
+   * Provides test data for ::testGetThirdPartySettings().
+   *
+   * @return array
+   *   Third party settings.
+   */
+  public function providerTestGetThirdPartySettings(): array {
+    $data = [];
+    $data['Initech third party settings'] = [
+      'Initech',
+      [
+        'Bill Lumbergh' => 'TPS reports',
+        'Milton Waddams' => 'Red Stapler',
+      ],
+    ];
+    $data['Chotchkies third party settings'] = [
+      'Chotchkies',
+      ['flair' => TRUE],
+    ];
+    $data['Nonexisting provider'] = [
+      'non_existing_provider',
+      [],
+    ];
+    return $data;
+  }
+
+  /**
+   * @covers ::getThirdPartySetting
+   * @dataProvider providerTestGetThirdPartySetting
+   */
+  public function testGetThirdPartySetting($provider, $key, $expected, $default = FALSE): void {
+    if ($default) {
+      $this->assertSame($expected, $this->section->getComponent('some-uuid')->getThirdPartySetting($provider, $key, $default));
+      return;
+    }
+    $this->assertSame($expected, $this->section->getComponent('some-uuid')->getThirdPartySetting($provider, $key));
+  }
+
+  /**
+   * Provides test data for ::testGetThirdPartySetting().
+   *
+   * @return array
+   *   Third party settings.
+   */
+  public function providerTestGetThirdPartySetting(): array {
+    $data = [];
+    $data['Initech third party setting for "Bill Lumbergh" key'] = [
+      'Initech',
+      'Bill Lumbergh',
+      'TPS reports',
+    ];
+    $data['Chotchkies third party setting for "flair" key'] = [
+      'Chotchkies',
+      'flair',
+      TRUE,
+    ];
+    $data['Chotchkies third party setting for nonexisting key'] = [
+      'Chotchkies',
+      'non_existing_key',
+      NULL,
+    ];
+    $data['Nonexisting provider third party setting for nonexisting key'] = [
+      'non_existing_provider',
+      'non_existing_key',
+      NULL,
+    ];
+    $data['Nonexisting provider third party setting for nonexisting key with a default value provided'] = [
+      'non_existing_provider',
+      'non_existing_key',
+      'default value',
+      'default value',
+    ];
+    return $data;
+  }
+
+  /**
+   * @covers ::setThirdPartySetting
+   * @dataProvider providerTestSetThirdPartySetting
+   */
+  public function testSetThirdPartySetting($provider, $key, $value, $expected): void {
+    $this->section->getComponent('some-uuid')->setThirdPartySetting($provider, $key, $value);
+    $this->assertSame($expected, $this->section->getComponent('some-uuid')->getThirdPartySettings($provider));
+  }
+
+  /**
+   * Provides test data for ::testSetThirdPartySettings().
+   *
+   * @return array
+   *   Third party settings.
+   */
+  public function providerTestSetThirdPartySetting(): array {
+    $data = [];
+    $data['Override "Milton Waddams" third party setting for Initech provider'] = [
+      'Initech',
+      'Milton Waddams',
+      'Storage B',
+      [
+        'Bill Lumbergh' => 'TPS reports',
+        'Milton Waddams' => 'Storage B',
+      ],
+    ];
+    $data['Add "Peter Gibbons" third party setting for Initech provider'] = [
+      'Initech',
+      'Peter Gibbons',
+      'Programmer',
+      [
+        'Bill Lumbergh' => 'TPS reports',
+        'Milton Waddams' => 'Red Stapler',
+        'Peter Gibbons' => 'Programmer',
+      ],
+    ];
+    $data['Add "Medical Providers" provider third party settings'] = [
+      'Medical Providers',
+      'Dr. Swanson',
+      'Hypnotist',
+      [
+        'Dr. Swanson' => 'Hypnotist',
+      ],
+    ];
+    return $data;
+  }
+
+  /**
+   * @covers ::unsetThirdPartySetting
+   * @dataProvider providerTestUnsetThirdPartySetting
+   */
+  public function testUnsetThirdPartySetting($provider, $key, $expected): void {
+    $this->section->getComponent('some-uuid')->unsetThirdPartySetting($provider, $key);
+    $this->assertSame($expected, $this->section->getComponent('some-uuid')->getThirdPartySettings($provider));
+  }
+
+  /**
+   * Provides test data for ::testUnsetThirdPartySetting().
+   *
+   * @return array
+   *   Third party settings.
+   */
+  public function providerTestUnsetThirdPartySetting(): array {
+    $data = [];
+    $data['Key with values'] = [
+      'Initech',
+      'Bill Lumbergh',
+      [
+        'Milton Waddams' => 'Red Stapler',
+      ],
+    ];
+    $data['Key without values'] = [
+      'Chotchkies',
+      'flair',
+      [],
+    ];
+    $data['Non-existing key'] = [
+      'Chotchkies',
+      'non_existing_key',
+      [
+        'flair' => TRUE,
+      ],
+    ];
+    $data['Non-existing provider'] = [
+      'non_existing_provider',
+      'non_existing_key',
+      [],
+    ];
+    return $data;
+  }
+
+  /**
+   * @covers ::getThirdPartyProviders
+   */
+  public function testGetThirdPartyProviders(): void {
+    $this->assertSame(['Initech', 'Chotchkies'], $this->section->getComponent('some-uuid')->getThirdPartyProviders());
+    $this->section->getComponent('some-uuid')->unsetThirdPartySetting('Chotchkies', 'flair');
+    $this->assertSame(['Initech'], $this->section->getComponent('some-uuid')->getThirdPartyProviders());
+  }
+
+  /**
+   * Tests that deprecation notices are triggered.
+   *
+   * @group legacy
+   *
+   * @todo Remove below test when the drupal:10.1.x branch is opened.
+   * @see https://www.drupal.org/project/drupal/issues/3160644
+   */
+  public function testDeprecationNotices(): void {
+    $this->expectDeprecation('Setting random section component properties is deprecated in drupal:10.2.0 and is removed from drupal:11.0.0. Component properties should be set via dedicated setters. See https://www.drupal.org/node/3100177');
+    $this->expectDeprecation('Getting additional properties is deprecated in drupal:10.2.0 and is removed from drupal:11.0.0. Additional component properties should be gotten via ::getThirdPartySetting(). See https://www.drupal.org/node/3100177');
+
+    // Instantiate SectionComponent with additional settings is deprecated.
+    new SectionComponent(
+      'some-uuid',
+      'some-region',
+      [],
+      // Provide deprecated 'additional' argument.
+      [
+        'spoiler-alert' => [
+          'glitch-in-accounting' => 'fixed',
+          'building-arson' => 'probably',
+          'milton-on-beach' => TRUE,
+        ],
+      ],
+      [],
+    );
+
+    // Instantiate SectionComponent object with preferred create() method.
+    $component = new SectionComponent(
+      'some-uuid',
+      'some-region',
+      [],
+      [],
+    );
+    // Call deprecated set() and get() methods.
+    $component->set('music', 'very 90s');
+    $component->get('music');
+  }
+
 }
diff --git a/core/modules/system/tests/fixtures/HtaccessTest/access_test.module.orig b/core/modules/system/tests/fixtures/HtaccessTest/access_test.module.orig
deleted file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0000000000000000000000000000000000000000
diff --git a/core/modules/system/tests/fixtures/HtaccessTest/access_test.php.orig b/core/modules/system/tests/fixtures/HtaccessTest/access_test.php.orig
deleted file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0000000000000000000000000000000000000000
diff --git a/core/profiles/demo_umami/config/install/core.entity_view_display.node.article.full.yml b/core/profiles/demo_umami/config/install/core.entity_view_display.node.article.full.yml
index ab8d49faceb15621720925c5f75eca41c6473fea..49fde4f2b33fbc74db802acdaf92605c6af77d08 100644
--- a/core/profiles/demo_umami/config/install/core.entity_view_display.node.article.full.yml
+++ b/core/profiles/demo_umami/config/install/core.entity_view_display.node.article.full.yml
@@ -39,6 +39,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 0
             additional: {  }
+            third_party_settings: {  }
           02d32417-145b-41a4-8d7a-27e4477b9666:
             uuid: 02d32417-145b-41a4-8d7a-27e4477b9666
             region: content
@@ -56,6 +57,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 1
             additional: {  }
+            third_party_settings: {  }
           f73af85e-15fc-4672-8b72-3ed91353e08c:
             uuid: f73af85e-15fc-4672-8b72-3ed91353e08c
             region: content
@@ -71,6 +73,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 2
             additional: {  }
+            third_party_settings: {  }
           957850fc-d5ea-4a6f-b3c9-dd2e4811a5c4:
             uuid: 957850fc-d5ea-4a6f-b3c9-dd2e4811a5c4
             region: content
@@ -81,6 +84,7 @@ third_party_settings:
                 entity: layout_builder.entity
             weight: 3
             additional: {  }
+            third_party_settings: {  }
           937c9738-b63e-409f-897a-c9fc98f6716e:
             uuid: 937c9738-b63e-409f-897a-c9fc98f6716e
             region: content
@@ -91,6 +95,7 @@ third_party_settings:
                 entity: layout_builder.entity
             weight: 4
             additional: {  }
+            third_party_settings: {  }
         third_party_settings: {  }
 id: node.article.full
 targetEntityType: node
diff --git a/core/profiles/demo_umami/config/install/core.entity_view_display.node.page.full.yml b/core/profiles/demo_umami/config/install/core.entity_view_display.node.page.full.yml
index a1f918afdac083a1099120ca98e4991c727094ba..d4444009fb51d795b13241f28cc35da10794097b 100644
--- a/core/profiles/demo_umami/config/install/core.entity_view_display.node.page.full.yml
+++ b/core/profiles/demo_umami/config/install/core.entity_view_display.node.page.full.yml
@@ -36,6 +36,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 0
             additional: {  }
+            third_party_settings: {  }
           57ad7b26-a88b-439e-a056-40f2de29a943:
             uuid: 57ad7b26-a88b-439e-a056-40f2de29a943
             region: content
@@ -46,6 +47,7 @@ third_party_settings:
                 entity: layout_builder.entity
             weight: 1
             additional: {  }
+            third_party_settings: {  }
           01b94e28-e38c-4849-98d6-ed77bca30afc:
             uuid: 01b94e28-e38c-4849-98d6-ed77bca30afc
             region: content
@@ -56,6 +58,7 @@ third_party_settings:
                 entity: layout_builder.entity
             weight: 2
             additional: {  }
+            third_party_settings: {  }
         third_party_settings: {  }
 id: node.page.full
 targetEntityType: node
diff --git a/core/profiles/demo_umami/config/install/core.entity_view_display.node.recipe.full.yml b/core/profiles/demo_umami/config/install/core.entity_view_display.node.recipe.full.yml
index 6eb48804da838599fe67d394ce0b901cc3a71291..99e26506106798c0dc1ed0043431db9731bcf0fa 100644
--- a/core/profiles/demo_umami/config/install/core.entity_view_display.node.recipe.full.yml
+++ b/core/profiles/demo_umami/config/install/core.entity_view_display.node.recipe.full.yml
@@ -51,6 +51,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 3
             additional: {  }
+            third_party_settings: {  }
           0eff9e1d-4e73-4748-b910-e5568df1d5aa:
             uuid: 0eff9e1d-4e73-4748-b910-e5568df1d5aa
             region: content
@@ -67,6 +68,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 2
             additional: {  }
+            third_party_settings: {  }
           44801518-fe93-421a-bdcb-550493c7925d:
             uuid: 44801518-fe93-421a-bdcb-550493c7925d
             region: content
@@ -82,6 +84,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 4
             additional: {  }
+            third_party_settings: {  }
         third_party_settings: {  }
       -
         layout_id: layout_oneplusfourgrid_section
@@ -107,6 +110,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 4
             additional: {  }
+            third_party_settings: {  }
           df8bfafc-210c-4d86-9745-e47081ab0fd4:
             uuid: df8bfafc-210c-4d86-9745-e47081ab0fd4
             region: fifth
@@ -122,6 +126,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 0
             additional: {  }
+            third_party_settings: {  }
           a2d450d0-08ce-4123-bca0-411bfa1da132:
             uuid: a2d450d0-08ce-4123-bca0-411bfa1da132
             region: fourth
@@ -139,6 +144,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 0
             additional: {  }
+            third_party_settings: {  }
           f91febc6-d924-47a2-8ffd-b71d3b2597c7:
             uuid: f91febc6-d924-47a2-8ffd-b71d3b2597c7
             region: third
@@ -156,6 +162,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 0
             additional: {  }
+            third_party_settings: {  }
           00488840-db50-4afe-9c30-a123e6707fa9:
             uuid: 00488840-db50-4afe-9c30-a123e6707fa9
             region: second
@@ -173,6 +180,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 0
             additional: {  }
+            third_party_settings: {  }
           69d8bce1-28ae-4287-a05b-a2166679f867:
             uuid: 69d8bce1-28ae-4287-a05b-a2166679f867
             region: first
@@ -192,6 +200,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 0
             additional: {  }
+            third_party_settings: {  }
         third_party_settings: {  }
       -
         layout_id: layout_twocol_section
@@ -215,6 +224,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 0
             additional: {  }
+            third_party_settings: {  }
           f61cae40-5865-4c4c-98fa-14b8234e7b98:
             uuid: f61cae40-5865-4c4c-98fa-14b8234e7b98
             region: second
@@ -230,6 +240,7 @@ third_party_settings:
                 third_party_settings: {  }
             weight: 0
             additional: {  }
+            third_party_settings: {  }
         third_party_settings: {  }
       -
         layout_id: layout_onecol
@@ -266,6 +277,7 @@ third_party_settings:
               items_per_page: none
             weight: 0
             additional: {  }
+            third_party_settings: {  }
         third_party_settings: {  }
 id: node.recipe.full
 targetEntityType: node