diff --git a/package_manager/tests/src/Kernel/EnabledExtensionsValidatorTest.php b/package_manager/tests/src/Kernel/EnabledExtensionsValidatorTest.php
index 617ee41191e570f5db206da88127b42cdcefd430..3dfe9b28990bcb39a7fbdbc6b10dd6bc8db8be06 100644
--- a/package_manager/tests/src/Kernel/EnabledExtensionsValidatorTest.php
+++ b/package_manager/tests/src/Kernel/EnabledExtensionsValidatorTest.php
@@ -102,8 +102,6 @@ class EnabledExtensionsValidatorTest extends PackageManagerKernelTestBase {
   public function testExtensionRemoved(array $packages, array $expected_results): void {
     $project_root = $this->container->get(PathLocator::class)->getProjectRoot();
     $this->installComposerInstallers($project_root);
-    // @todo Remove this in https://www.drupal.org/project/automatic_updates/issues/3355553.
-    $this->setInstallerPaths([], $project_root);
 
     $active_manipulator = new ActiveFixtureManipulator();
     $stage_manipulator = $this->getStageFixtureManipulator();
diff --git a/package_manager/tests/src/Traits/ComposerInstallersTrait.php b/package_manager/tests/src/Traits/ComposerInstallersTrait.php
index dd36538a262229debdf7b44c162f4f3f7ca1c4ef..2da3eed55459afe6002bfa7feda028480f0e28e8 100644
--- a/package_manager/tests/src/Traits/ComposerInstallersTrait.php
+++ b/package_manager/tests/src/Traits/ComposerInstallersTrait.php
@@ -45,6 +45,9 @@ trait ComposerInstallersTrait {
       ->addConfig(['allow-plugins.composer/installers' => TRUE])
       ->commitChanges($dir);
     (new Process(['composer', 'require', 'composer/installers:@dev', $working_dir_option]))->mustRun();
+
+    // Use the default installer paths for Drupal core and extensions.
+    $this->setInstallerPaths([], $dir);
   }
 
   /**