>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3632337. --> Reported by: [anakinyo](https://www.drupal.org/user/3575896) >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p> After upgrading UI Patterns from <strong>2.0.20 to 2.0.23</strong> (alongside Drupal core 11.3.18 &rarr; 11.4.10), the source selector dropdown<br> is no longer displayed in component slots. Instead, a simple "Add content" button appears, which automatically creates a Wysiwyg source<br> without allowing editors to choose other source types (Component, Block, Field, Entity references, etc.). </p> <p> This is a <strong>regression</strong> that breaks the expected UI Patterns workflow for content editors. </p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <ol> <li>Navigate to Layout Builder</li> <li>Add or edit a UI Patterns component with slots (e.g., Card, Hero, or any component with defined slots like "items", "actions", "content")</li> <li>Focus on a slot in the component configuration form</li> <li><strong>Expected behavior:</strong> See a select dropdown with the placeholder "<em>- Select a source to add -</em>" and options like: <ul> <li>Component</li> <li>Wysiwyg</li> <li>Block</li> <li>[Entity] &rarr; [Field]</li> <li>[Entity] &rarr; Referenced [Entity]</li> </ul> </li> <li><strong>Actual behavior:</strong> Only see a submit button:<br> <pre><pre>&amp;lt;input<br>&nbsp; class="uip-slot-add"<br>&nbsp; data-uip-slot-add="settings[formatter][settings][ui_patterns][slots][items]"<br>&nbsp; type="submit"<br>&nbsp; value="Add content"&amp;gt;</pre></pre><p> When clicked, it automatically adds a <strong>Wysiwyg</strong> source without any selection step. </p></li> </ol> <p> <strong>Environment:</strong> </p> <ul> <li><strong>Drupal Core:</strong> 11.4.10</li> <li><strong>UI Patterns:</strong> 2.0.23</li> <li><strong>Previous working version:</strong> UI Patterns 2.0.20 + Drupal 11.3.18</li> <li><strong>PHP:</strong> 8.4.27</li> </ul> <p> <em>No custom code involved &mdash; this is a pure UI Patterns module regression.</em> The project has no custom <code>hook_form_alter()</code> modifying UI Patterns slot forms, no decorated services, and no Event Subscribers affecting this behavior. </p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p> Investigate changes between UI Patterns <strong>2.0.20 and 2.0.23</strong> that affect: </p> <ul> <li>Source selection logic in <code>ComponentFormBase::buildSourceSelector()</code></li> <li>Default source assignment in <code>selectDefaultSource()</code></li> <li>Source availability and filtering for slots</li> <li>The <code>$always_visible</code> flag or source count conditions</li> </ul> <p> The regression should be addressed to restore the source selector dropdown, allowing editors to choose the appropriate source type when adding content to slots. </p> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <ul> <li>Review changes in <code>src/Element/ComponentFormBase.php</code> between 2.0.20 and 2.0.23</li> <li>Review changes in <code>src/Element/ComponentSlotForm.php</code> between 2.0.20 and 2.0.23</li> <li>Identify why source count is reduced to 1 or why a default source is auto-selected</li> <li>Provide a patch to restore the expected behavior</li> </ul> <h3 id="summary-ui-changes">User interface changes</h3> <p> The source selector dropdown (<code>&amp;lt;select name="...[add_more_button]"&amp;gt;</code>) has been replaced by a simple submit button (<code>&amp;lt;input class="uip-slot-add" type="submit"&amp;gt;</code>) in UI Patterns slot configuration forms. </p> <h3 id="summary-data-model-changes">Data model changes</h3> <p>None. The underlying data model remains unchanged; only the UI form element rendering is affected.</p> <h3 id="summary-api-changes">API changes</h3> <p>None. This is a UI regression, not an API change.</p> >>> [!note] Pre-migration files - [ui\_pattern\_bug.png](https://www.drupal.org/files/issues/2026-10-22/ui_pattern_bug.png) >>>