fix(ServerForm): Fix AJAX error when converting debug flags (#1377)

src/Form/ServerForm.php

@@ -7,6 +7,7 @@
 use Drupal\Core\Ajax\AjaxResponse;
 use Drupal\Core\Ajax\ReplaceCommand;
 use Drupal\Core\Entity\EntityForm;
+use Drupal\Core\Entity\EntityInterface;
 use Drupal\Core\Entity\EntityTypeInterface;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Form\SubformState;
@@ -243,6 +244,19 @@ public function form(array $form, FormStateInterface $formState): array {
     return $form;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  protected function copyFormValuesToEntity(EntityInterface $entity, array $form, FormStateInterface $form_state): void {
+    // Translate the debug flag from individual checkboxes to the enum value
+    // that the GraphQL library expects.
+    $debug_flag = $form_state->getValue('debug_flag');
+    if (is_array($debug_flag)) {
+      $form_state->setValue('debug_flag', array_sum($debug_flag));
+    }
+    parent::copyFormValuesToEntity($entity, $form, $form_state);
+  }
+
   /**
    * {@inheritdoc}
    *
@@ -274,9 +288,6 @@ public function validateForm(array &$form, FormStateInterface $formState): void
    * {@inheritdoc}
    */
   public function submitForm(array &$form, FormStateInterface $formState): void {
-    // Translate the debug flag from individual checkboxes to the enum value
-    // that the GraphQL library expects.
-    $formState->setValue('debug_flag', array_sum($formState->getValue('debug_flag')));
     parent::submitForm($form, $formState);
 
     $schema = $formState->getValue('schema');