Cloned group copies previous 'image_advanced'

I saw a similar problem in a previous topic, but it wasn't quite the same.

When I create an 'image_advanced' field within a group, then save it, then add a new group, the 'image_advanced' field gets copied over. The images can be deleted and saved without problems. But they only appear again on a newly added group.

$meta_boxes[] = array(
  'id' => 'example_metabox',
  'title' => 'Example',
  'post_types' => array('page'),
  'context' => 'advanced',
  'priority' => 'high',
  'autosave' => 'false',
  'fields' => array(
    
    array(
      'id' => '_images_example',
      'type' => 'group',
      'default_state' => 'expanded',
      'collapsible' => true,
      'save_state' => true,
      'clone' => true,
      'sort_clone' => true,

      'fields' => array(
        array(
          'id' => '_images',
          'type' => 'image_advanced',
          'name' => 'Images',
        ),
      ),

    ),

  ),
);