Fix broken tests on main
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3583444. --> Reported by: [feyp](https://www.drupal.org/user/998680) Related to !6 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>We fixed the build on main in <span class="drupalorg-gitlab-issue-link drupalorg-gitlab-link-wrapper"><a href="https://git.drupalcode.org/project/menu_entity_index/-/work_items/3582348" class="drupalorg-gitlab-link">https://git.drupalcode.org/project/menu_entity_index/-/work_items/3582348</a></span>, but the tests on main are currently still broken. Fix them in a backward-compatible way.</p>
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