Unable to save the Taxonomy values

I am trying to simplify the default meta boxes that handle the custom taxonomies.

I have custom hierarchical taxonomies for a post type. And each of these taxonomies have a lot of values, as a result of which the user needs to scroll through the default metabox to check the desired values.

I tried using select advance, to replace the default meta box with a simpler interface, it helps when the values are suggested when the user starts typing. I also have clone set to true, since I need multiple values for each of the taxonomies.

The problem is, when I select the values I need and save, it does not actually save them to the DB. What did I miss? Am I doing something wrong?

Here is the code I added to the functions.php for the above mentioned metabox:

function mdln_get_meta_box( $meta_boxes ) {
	$prefix = 'mdln-';

	$meta_boxes[] = array(
		'id' => 'catalog_page',
		'title' => esc_html__( 'Catalog Attributes', 'mdln-catalog' ),
		'post_types' => array( 'catalog_page' ),
		'context' => 'side',
		'priority' => 'high',
		'multiple' => true,
		'autosave' => true,
		'fields' => array(
			array(
				'id' => $prefix . 'catalog_category',
				'type' => 'taxonomy_advanced',
				'name' => esc_html__( 'Catalog Category', 'mdln-catalog' ),
				'desc' => esc_html__( 'Select the catalog category', 'mdln-catalog' ),
				'taxonomy' => 'catalog_category',
				'field_type' => 'select_advanced',
				'clone' => true,
				'parent' => true,
				'sort_clone' => true,
				'add_button' => esc_html__( 'Add another category', 'mdln-catalog' ),
			),
			array(
				'id' => $prefix . 'product_family',
				'type' => 'taxonomy_advanced',
				'name' => esc_html__( 'Product Family', 'mdln-catalog' ),
				'desc' => esc_html__( 'Select the product family', 'mdln-catalog' ),
				'taxonomy' => 'catalog_productfamily',
				'field_type' => 'select_advanced',
				'clone' => true,
				'parent' => true,
				'sort_clone' => true,
				'add_button' => esc_html__( 'Add another Product family', 'mdln-catalog' ),
			),
			array(
				'id' => $prefix . 'catalog_productgroup',
				'type' => 'taxonomy_advanced',
				'name' => esc_html__( 'Product Family', 'mdln-catalog' ),
				'desc' => esc_html__( 'Select the product family', 'mdln-catalog' ),
				'taxonomy' => 'catalog_productgroup',
				'field_type' => 'select_advanced',
				'clone' => true,
				'parent' => true,
				'sort_clone' => true,
				'add_button' => esc_html__( 'Add another Product Group', 'mdln-catalog' ),
			),
			array(
				'id' => $prefix . 'catalog_searchkey',
				'type' => 'taxonomy_advanced',
				'name' => esc_html__( 'Product Family', 'mdln-catalog' ),
				'desc' => esc_html__( 'Select the product family', 'mdln-catalog' ),
				'taxonomy' => 'catalog_searchkey',
				'field_type' => 'select_advanced',
				'clone' => true,
				'parent' => true,
				'sort_clone' => true,
				'add_button' => esc_html__( 'Add another SearchKey', 'mdln-catalog' ),
			),
		),
	);

	return $meta_boxes;
}
add_filter( 'rwmb_meta_boxes', 'mdln_get_meta_box' );

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