Валидация формы создания айтема tabs. Мин кол-во айтемов д.быть 2

basf_site.module

/**
 * Implements hook_field_widget_paragraphs_form_alter().
 */
function basf_site_field_widget_paragraphs_browser_form_alter(
  &$element,
  FormStateInterface $formState,
): void
{

  /** @var \Drupal\Core\Entity\EntityForm $formObject */
  $formObject = $formState->getFormObject();
  if ($formObject instanceof EntityForm) {
    $entityType = $formObject->getEntity()->bundle();
  }

  if (isset($element['#paragraph_type'])) {

    switch ($element['#paragraph_type']) {
      case 'organism_tabs':
        switch ($entityType) {
          case 'overview':
           $element['#element_validate'][] = 'BasfSiteValidateTabs';
            break;
        }
        break;
    }
  }
}

/**
 * Validate Tabs paragraph.
 *
 * @param array $referenceForm
 *   Reference form array.
 *
 * @param \Drupal\Core\Form\FormStateInterface $formState
 *   Form state object.
 */
function BasfSiteValidateTabs(array &$referenceForm, FormStateInterface $formState): void {
  if (count(array_filter(array_keys($referenceForm['subform']['field_tab_item']['widget']), 'is_int')) < 2) {
    $str = 'Error';
    $formState->setError($referenceForm, $str);
  }
}