Unpublished paragraphs in translated content incorrectly showing source language content to anonymous users.

florianmuellerch I got the same problem as you, and I think the hook `hook_entity_access` could be the solution:

/**
 * Implements hook_entity_access().
 */
function my_custom_paragraphs_entity_access(\Drupal\Core\Entity\EntityInterface $entity, $operation, \Drupal\Core\Session\AccountInterface $account) {
  if ($entity->getEntityTypeId() == 'paragraph') {
    if ($operation == 'view') {
      // Get the current language.
      $current_language = \Drupal::languageManager()->getCurrentLanguage()->getId();

      // Check if the paragraph has a translation in the current language.
      if ($entity->hasTranslation($current_language)) {
        // Get the translation.
        $translation = $entity->getTranslation($current_language);

        // Check if the translation is not published.
        if (!$translation->isPublished()) {
          return \Drupal\Core\Access\AccessResult::forbidden();
        }
      }
    }
  }
  return \Drupal\Core\Access\AccessResult::neutral();
}