Does anyone know if there is a way to handle a custom taxonomy for the nav_menu_item built’in post type?
When I assign my custom taxonomy to this post type, i don’t see any change in the menu editor…
It works well with posts, pages and custom post types.

Here how I’ve registered my custom taxonomy:

  add_action( 'init', 'my_region_taxo', 0 );
  function my_region_taxo() {
    $labels = array(
        'name'                       => _x( 'Regions', 'Taxonomy General Name', 'my-text-domain' ),
        'singular_name'              => _x( 'Region', 'Taxonomy Singular Name', 'my-text-domain' ),
        (...)
    );
    $rewrite = array(
        'slug'                       => 'region',
        'with_front'                 => true,
        'hierarchical'               => true,
    );
    $args = array(
        'labels'                     => $labels,
        'hierarchical'               => true,
        'public'                     => true,
        'show_ui'                    => true,
        'show_admin_column'          => true,
        'show_in_nav_menus'          => false,
        'show_tagcloud'              => false,
        'rewrite'                    => $rewrite,
        'show_in_rest'               => true,
    );
    register_taxonomy(
        'my_region_taxonomy',
        array(
            'post',
            'page',
            'nav_menu_item'
        ),
        $args
    );
  }