Samit Khulve
--- a/core/modules/language/tests/src/Functional/LanguageSwitchingTest.php
+++ b/core/modules/language/tests/src/Functional/LanguageSwitchingTest.php
    // @todo This is testing the current behavior with the big_pipe module
    //   enabled. This behavior is a bug will be fixed in
    //   https://www.drupal.org/project/drupal/issues/3349201.
-    $this->doTestLanguageBlock404($block->label(), '<front>');
+    $this->doTestLanguageBlock404($block->label(), 'system/404');