Issue #3408816 by Grimreaper, Sharique: When editing a paragraph type, all checkboxes are checked

src/Plugin/paragraphs/Behavior/UIStyleOptions.php

@@ -180,7 +180,7 @@ class UIStyleOptions extends ParagraphsBehaviorBase {
           // @phpstan-ignore-next-line
           $form['enabled_styles'][$group_key]['#open'] = $opened_group;
           if (isset($this->configuration['enabled_styles'][$group_key])) {
-            $plugin_element['#default_value'] = isset($this->configuration['enabled_styles'][$group_key][$style_plugin_id]) ? $style_plugin_id : '';
+            $plugin_element['#default_value'] = $this->configuration['enabled_styles'][$group_key][$style_plugin_id] ?? '';
           }
           $form['enabled_styles'][$group_key][$style_plugin_id] = $plugin_element;
         }