🇩🇪Germany @Bruno2

Ok, here is a small fix up, please check for the values. I tested it only a little bit:

Rewrite function to get display the values on edit nodes:

function _image_field_caption_widget_process($element, &$form_state, $form) {
   $entity = NULL;
  $form_object = $form_state->getFormObject();
  if ($form_object instanceof EntityFormInterface) {
    $entity = $form_object->getEntity();
  }

  if (!$entity) {
    return $element;
  }

  // Get caption from storage
  $caption = \Drupal::service('image_field_caption.storage')->getCaption(
    $entity->getEntityTypeId(),
    $entity->bundle(),
    $element['#field_name'],
    $entity->id(),
    $entity->getRevisionId(),
    $entity->language()->getId(),
    $element['#delta']
  );

  // Add the caption field to the widget
  $element['image_field_caption'] = [
    '#type' => 'text_format',
    '#title' => t('Caption'),
    '#default_value' => $caption['caption'] ?? '',
    '#format' => $caption['caption_format'] ?? 'plain_text',
    '#weight' => 10,
    '#required' => $element['#caption_field_required'],
    '#access' => (bool) $element['#value']['fids'],
    '#element_validate' => $element['#caption_field_required'] ? ['_image_field_caption_validate_required'] : [],
  ];

  return $element;
}

Delete the whole function:

function image_entity_storage_load_field_caption(array $entities, $entity_type_id) {}

And insert this for it:

function image_field_caption_preprocess_field(&$variables) {
  // Only process image fields
  if ($variables['element']['#field_type'] !== 'image') {
    return;
  }

  $entity = $variables['element']['#object'];
  $field_name = $variables['element']['#field_name'];
  $entity_type = $entity->getEntityTypeId();
  $bundle = $entity->bundle();
  $entity_id = $entity->id();
  $revision_id = $entity->getRevisionId();
  $langcode = $entity->language()->getId();

  foreach ($variables['items'] as $delta => &$item) {
    if (!isset($item['content']['#item'])) {
      continue;
    }

    // Get caption using the actual storage service method
    $caption = \Drupal::service('image_field_caption.storage')
      ->getCaption(
        $entity_type,
        $bundle,
        $field_name,
        $entity_id,
        $revision_id,
        $langcode,
        $delta
      );

    if (!empty($caption['caption'])) {
      $item['content']['caption'] = [
        '#type' => 'markup',
        '#markup' => $caption['caption'],
        '#format' => $caption['caption_format'],
        '#weight' => 10,
      ];
    }
  }
}

image_field_caption_entity_insert and image_field_caption_entity_update should also be handled in the widget.

**
 * Implements hook_form_FORM_ID_alter()
 */
function MODULE_NAME_form_FORM_ID_alter(&$form, $form_state, $form_id) {

  $form['submit']['#submit'][] = 'custom_submit_function';
}

function custom_submit_function($form, $form_state) {
  ....
}

In Drupal 10 (with more than 8k nodes), every page that uses hook_entity_storage_load runs infinite loops. Therefore /admin/content is not available. Cron cannot finish its run and nodes cannot be deleted via the Drupal API. The patches don't help, so it must be limeted to the current node, without load all entities. I dont think that hook_entity_storage_load is the best hook to set or get the values for this field.

Bruno2 → created an issue.

Bruno2 → created an issue.

The domain_simple_sitemap project does not work. There are so many problems to make it work (missing classes of simple_sitemap or parent class declarations) in Drupal 9.4.8 with PHP 8.1.1. I uninstalled it after an hour of debugging. Isn't there a way to use the simple_sitemap with domain access?