Max clone does not work if I have subgroup

Hello I am having a problem, I not find anything related.

If I have a subgroup with Group enabled to clone, I can not use the max_cloner. (The button clone the main group disappears)

If I do not have a Subgroup and use max_cloner works perfectly.

add_filter( 'rwmb_meta_boxes', 'demo_nested_groups' );
function demo_nested_groups( $meta_boxes ) {
	$meta_boxes[] = array(
		'title'  => __( 'Multi-level nested groups', 'textdomain' ),
		'fields' => array(
			array(
				'id'     => 'group',
				'type'   => 'group',
				'clone'  => true,
                                'max_clone' => 5,
				'fields' => array(
					// Normal field (cloned)
					array(
						'name'  => __( 'Text', 'textdomain' ),
						'id'    => 'text',
						'type'  => 'text',
						'clone' => true,
					),
					// Nested group level 2
					array(
						'name'   => __( 'Sub group', 'textdomain' ),
						'id'     => 'sub_group',
						'type'   => 'group',
						'clone'  => true,
						'fields' => array(
							// Normal field (cloned)
							array(
								'name'  => __( 'Sub text', 'textdomain' ),
								'id'    => 'sub_text',
								'type'  => 'text',
								'clone' => true,
							),
						),
					),
				),
			),
		),
	);
	return $meta_boxes;
}