Meta Box

I also have additional meta-definition for setting pics for terms in custom plugin as:

// Add custom meta for Types of Glass Taxonomy
add_filter( 'rwmb_meta_boxes', 'prefix_register_taxonomy_meta_boxes' );
function prefix_register_taxonomy_meta_boxes( $meta_boxes ){
    $meta_boxes[] = array(
        'title'      => 'Additional Meta for Doors',
        'taxonomies' => array('type-of-glass','jamb'), // THIS: List of taxonomies. Array or string

        'fields' => array(
            array(
                'name' => 'Featured?',
                'id'   => 'featured_glass',
                'type' => 'checkbox',
            ),
            array(
                'name' => 'Preview Image',
                'id'   => 'glass_single_image',
                'type' => 'single_image',
            ),
        ),
    );
    return $meta_boxes;
}

Maybe that is causing the issue. What to use instead of taxonomies for array of taxonomies here, if one of taxonomies is advanced taxonomy?

Thank you for pointing me there. If I have a group defined from UI, can I add filter for sub-group titles only using PHP function, or I have to delete group created from UI and then re-define the whole array programmatically?