Checkbox Tree not displayed in Sub-group fields

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?

Aha! Thank you. Is there a way to display hierarchical taxonomy not collapsed by default, or at least somehow visually indicate terms with children?

I shall try to implement it, since Metabox allows a lot of customisation on the back end and I figured out how to load amending styles. But yes, from a layperson perspective the expected default behaviour is to have checkbox tree blooming, not collapsed. Since it is a default behaviour in side panel WP Metabox.