only in patch2:
unchanged:
--- a/core/modules/contact/src/Tests/ContactPersonalTest.php
+++ b/core/modules/contact/src/Tests/ContactPersonalTest.php
@@ -156,6 +156,7 @@ function testPersonalContactAccess() {
 
     // Revoke the personal contact permission for the anonymous user.
     user_role_revoke_permissions(RoleInterface::ANONYMOUS_ID, array('access user contact forms'));
+    drupal_flush_all_caches();
     $this->drupalGet('user/' . $this->contactUser->id() . '/contact');
     $this->assertResponse(403);
     $this->assertCacheContext('user.permissions');