diff --git a/core/modules/layout_builder/src/Plugin/Block/InlineBlock.php b/core/modules/layout_builder/src/Plugin/Block/InlineBlock.php
--- a/core/modules/layout_builder/src/Plugin/Block/InlineBlock.php
+++ b/core/modules/layout_builder/src/Plugin/Block/InlineBlock.php
@@ -10,6 +10,7 @@
 use Drupal\Core\Block\BlockBase;
 use Drupal\Core\Entity\Entity\EntityFormDisplay;
 use Drupal\Core\Entity\EntityDisplayRepositoryInterface;
+use Drupal\Core\Entity\EntityRepositoryInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Form\SubformStateInterface;
@@ -64,6 +65,13 @@ class InlineBlock extends BlockBase implements ContainerFactoryPluginInterface,
   protected $isNew = TRUE;

   /**
+   * The entity repository.
+   *
+   * @var \Drupal\Core\Entity\EntityRepositoryInterface
+   */
+  protected $entityRepository;
+
+  /**
    * The current user.
    *
    * @var \Drupal\Core\Session\AccountInterface
@@ -85,8 +93,10 @@ class InlineBlock extends BlockBase implements ContainerFactoryPluginInterface,
    *   The entity display repository.
    * @param \Drupal\Core\Session\AccountInterface $current_user
    *   The current user.
+   * @param \Drupal\Core\Entity\EntityRepositoryInterface $entity_repository
+   *   The entity repository.
    */
-  public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityTypeManagerInterface $entity_type_manager, EntityDisplayRepositoryInterface $entity_display_repository, AccountInterface $current_user) {
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityTypeManagerInterface $entity_type_manager, EntityDisplayRepositoryInterface $entity_display_repository, AccountInterface $current_user, EntityRepositoryInterface $entity_repository) {
     parent::__construct($configuration, $plugin_id, $plugin_definition);

     $this->entityTypeManager = $entity_type_manager;
@@ -95,6 +105,7 @@ class InlineBlock extends BlockBase implements ContainerFactoryPluginInterface,
     if (!empty($this->configuration['block_revision_id']) || !empty($this->configuration['block_serialized'])) {
       $this->isNew = FALSE;
     }
+    $this->entityRepository = $entity_repository;
   }

   /**
@@ -107,6 +118,7 @@ class InlineBlock extends BlockBase implements ContainerFactoryPluginInterface,
       $plugin_definition,
       $container->get('entity_type.manager'),
       $container->get('entity_display.repository'),
       $container->get('current_user'),
+      $container->get('entity.repository'),
     );
   }
@@ -128,6 +140,10 @@ class InlineBlock extends BlockBase implements ContainerFactoryPluginInterface,
    */
   public function blockForm($form, FormStateInterface $form_state) {
     $block = $this->getEntity();
+    if (!$this->isNew && !$block->isNew() && empty($this->configuration['block_serialized'])) {
+      // Get the active block for editing purposes.
+      $block = $this->entityRepository->getActive('block_content', $block->id());
+    }

     // Add the entity form display in a process callback so that #parents can
     // be successfully propagated to field widgets.