>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3563263. --> Reported by: [smustgrave](https://www.drupal.org/user/3252890) Related to !20 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>Appears to be missing schema entry for custom formatter</p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <p>Install configuration inspector and see that the mermaid field is throwing errors</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Add a schema</p> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <h3 id="summary-ui-changes">User interface changes</h3> <h3 id="summary-api-changes">API changes</h3> <h3 id="summary-data-model-changes">Data model changes</h3>