diff -u b/core/tests/Drupal/KernelTests/Core/Asset/AttachedAssetsTest.php b/core/tests/Drupal/KernelTests/Core/Asset/AttachedAssetsTest.php
--- b/core/tests/Drupal/KernelTests/Core/Asset/AttachedAssetsTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Asset/AttachedAssetsTest.php
@@ -253,9 +253,9 @@
    *
    * @group legacy
    * @see \Drupal\Core\Render\Element\HtmlTag::preRenderConditionalComments()
-   * @expectedDeprecation Support for IE Conditional Comments is deprecated in drupal:9.1.0 and is removed from drupal:10.0.0. See https://www.drupal.org/node/3102997
    */
   public function testBrowserConditionalComments() {
+    $this->expectDeprecation('Support for IE Conditional Comments is deprecated in drupal:9.1.0 and is removed from drupal:10.0.0. See https://www.drupal.org/node/3102997');
     $default_query_string = $this->container->get('state')->get('system.css_js_query_string') ?: '0';
 
     $build['#attached']['library'][] = 'common_test/browsers';