diff -u b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
--- b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
@@ -47,7 +47,6 @@
 
     for ($i = 0; $i < 15; $i++) {
       $page->clickLink('sort by Title');
-      $session_assert->assertWaitOnAjaxRequest();
       $session_assert->statusCodeEquals(200);
     }
   }