>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3570463. --> Reported by: [joelpittet](https://www.drupal.org/user/160302) Related to !83 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>The <code>calendar_month_multiple_entity</code> theme hook was registered and had a Twig template, but there were no in-repository <code>#theme</code> or <code>theme()</code> usages. The Twig template also triggered a parse warning, resulting in dead code and an unnecessary compatibility issue.</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Remove the unused Twig template, theme hook definition, and related preprocess function to eliminate dead code and<br> avoid the Twig parse warning.</p>