diff -u b/core/modules/contextual/tests/src/FunctionalJavascript/ContextualLinksTest.php b/core/modules/contextual/tests/src/FunctionalJavascript/ContextualLinksTest.php
--- b/core/modules/contextual/tests/src/FunctionalJavascript/ContextualLinksTest.php
+++ b/core/modules/contextual/tests/src/FunctionalJavascript/ContextualLinksTest.php
@@ -36,11 +36,13 @@
     ]));
 
     $this->drupalGet('user');
-    $this->assertSession()->elementNotExists('css', '.contextual button');
+    $contextualLinks = $this->assertSession()->waitForElement('css', '.contextual button');
+    $this->assertEmpty($contextualLinks);
 
     // Ensure visibility remains correct after cached paged load.
     $this->drupalGet('user');
-    $this->assertSession()->elementNotExists('css', '.contextual button');
+    $contextualLinks = $this->assertSession()->waitForElement('css', '.contextual button');
+    $this->assertEmpty($contextualLinks);
 
     // Grant permissions to use contextual links on blocks.
     $this->grantPermissions(Role::load(Role::AUTHENTICATED_ID), [