>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3538558. --> Reported by: [jurgenhaas](https://www.drupal.org/user/168924) >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>When upcasting config arguments, boolean values of <code>FALSE</code> are removed as that's required during form submission. However, when building the config form, that's causing a problem.</p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Do not unset FALSE config values during config form build, only during form submission.</p>