diff -u b/core/lib/Drupal/Core/Extension/Extension.php b/core/lib/Drupal/Core/Extension/Extension.php
--- b/core/lib/Drupal/Core/Extension/Extension.php
+++ b/core/lib/Drupal/Core/Extension/Extension.php
@@ -68,6 +68,8 @@
    *   'core/modules/node/node.info.yml'.
    * @param string $filename
    *   (optional) The filename of the main extension file; e.g., 'node.module'.
+   * @param string $name
+   *   (optional) The name of the extension.
    */
   public function __construct($root, $type, $pathname, $filename = NULL, $name = NULL) {
     // @see \Drupal\Core\Theme\ThemeInitialization::getActiveThemeByName()
reverted:
--- b/core/lib/Drupal/Core/Update/UpdateRegistry.php
+++ a/core/lib/Drupal/Core/Update/UpdateRegistry.php
@@ -7,7 +7,6 @@
 use Drupal\Core\Extension\Extension;
 use Drupal\Core\Extension\ExtensionDiscovery;
 use Drupal\Core\KeyValueStore\KeyValueStoreInterface;
-use Drupal\Core\Site\Settings;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
 /**
@@ -68,13 +67,6 @@
    */
   protected $sitePath;
 
-  /**
-   * Discovered extensions in the system.
-   *
-   * @var \Drupal\Core\Extension\ExtensionDiscovery
-   */
-  protected ExtensionDiscovery $extensionDiscovery;
-
   /**
    * Constructs a new UpdateRegistry.
    *
@@ -287,13 +279,10 @@
    */
   protected function scanExtensionsAndLoadUpdateFiles() {
     // Scan for extensions.
+    $extension_discovery = new ExtensionDiscovery($this->root, FALSE, [], $this->sitePath);
+    $module_extensions = $extension_discovery->scan('module');
+    $theme_extensions = $this->includeThemes() ? $extension_discovery->scan('theme') : [];
+    $profile_extensions = $extension_discovery->scan('profile');
-    if (!isset($this->extensionDiscovery)) {
-      $use_file_cache = Settings::get('update_registry_use_file_cache', FALSE);
-      $this->extensionDiscovery = new ExtensionDiscovery($this->root, $use_file_cache, [], $this->sitePath);
-    }
-    $module_extensions = $this->extensionDiscovery->scan('module');
-    $theme_extensions = $this->includeThemes() ? $this->extensionDiscovery->scan('theme') : [];
-    $profile_extensions = $this->extensionDiscovery->scan('profile');
     $extensions = array_merge($module_extensions, $theme_extensions, $profile_extensions);
 
     $this->loadUpdateFiles($extensions);
only in patch2:
unchanged:
--- a/core/tests/Drupal/Tests/Core/Extension/ExtensionDiscoveryTest.php
+++ b/core/tests/Drupal/Tests/Core/Extension/ExtensionDiscoveryTest.php
@@ -53,12 +53,12 @@ public function testExtensionDiscoveryVfs() {
 
     $this->assertEquals($files_by_type_and_name_expected, $files_by_type_and_name);
 
-    $extension_expected = new Extension($root, 'module', 'core/modules/system/system.info.yml', 'system.module');
+    $extension_expected = new Extension($root, 'module', 'core/modules/system/system.info.yml', 'system.module', 'system');
     $extension_expected->subpath = 'modules/system';
     $extension_expected->origin = 'core';
     $this->assertEquals($extension_expected, $extensions_by_type['module']['system'], 'system');
 
-    $extension_expected = new Extension($root, 'theme_engine', 'core/themes/engines/twig/twig.info.yml', 'twig.engine');
+    $extension_expected = new Extension($root, 'theme_engine', 'core/themes/engines/twig/twig.info.yml', 'twig.engine', 'twig');
     $extension_expected->subpath = 'themes/engines/twig';
     $extension_expected->origin = 'core';
     $this->assertEquals($extension_expected, $extensions_by_type['theme_engine']['twig'], 'twig');
@@ -92,6 +92,7 @@ public function testExtensionDiscoveryCache() {
     // FileCache item should now be an array.
     $this->assertSame([
       'type' => 'module',
+      'name' => 'user',
       'pathname' => 'core/modules/user/user.info.yml',
       'filename' => 'user.module',
       'subpath' => 'modules/user',