When cloning a node, paragraphs from the original node have as parent_id the node cloned ID

Not sure if this bug is related to entity_clone or entity_reference_revision module.

The thing happens in the postsave() method of EntityReferenceRevisionsItem class

// If the parent id has changed then set it.
    if ($entity->get($parent_id)->value != $parent_entity->id()) {
      $entity->set($parent_id, $parent_entity->id());
      $needs_save = TRUE;
    }

The $parent_entity is the new node cloned and so the parent_id is updated. But this shouldn't occurs as, theorically, the original paragraph shouldn't be saved.

As a workaround, with an event subscriber you can re-save the original entity to trigger again the postsave() method and set the right parent_id on the original paragraphs.

/**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    return [
      EntityCloneEvents::POST_CLONE => 'onPostClone'
    ];
  }


  /**
   * On entity clone post event.
   *
   * @param \Drupal\entity_clone\Event\EntityCloneEvent $event
   *   The entity clone event instance.
   *
   * @throws \Drupal\Core\Entity\EntityStorageException
   */
  public function onPostClone(EntityCloneEvent $event) {
    $entity = $event->getEntity();
    if ($entity instanceof ContentEntityInterface) {
      $entity->save();
    }
  }