My custom taxonomies are not showing up in the admin menus - wordpress-theming

Question

Hello, nice to meet you all in advance, this is my first post in this forum.
I am offering an update to one of my old WordPress themes.
I have already registered some custom taxonomies, but now I have a problem:
My taxonomies are not displayed in the navigation menus of the WordPress dashboard:
See this
This is my code:
if ( ! function_exists( 'nf_register_taxonomies' ) ) {
function nf_register_taxonomies() {
// Directors
$directors_labels = array(
'name' => __( 'Director', 'nf-languages' ),
'singular_name' => __( 'Director', 'nf-languages' ),
'search_items' => __( 'Search in Directors', 'nf-languages' ),
'all_items' => __( 'All Directors', 'nf-languages' ),
'parent_item' => __( 'Parent Director', 'nf-languages' ),
'parent_item_colon' => __( 'Parent Director:', 'nf-languages' ),
'edit_item' => __( 'Edit Director', 'nf-languages' ),
'update_item' => __( 'Update Director', 'nf-languages' ),
'add_new_item' => __( 'Add New Director', 'nf-languages' ),
'new_item_name' => __( 'Director Name', 'nf-languages' ),
'menu_name' => __( 'Directors', 'nf-languages' ),
);
$directors_args = array(
'hierarchical' => false,
'labels' => $directors_labels,
'show_ui' => true,
'show_admin_column' => true,
'show_in_rest' => true,
'show_in_menu' => true,
'show_in_nav_menus' => true,
'query_var' => true,
'rewrite' => array( 'slug' => 'director' ),
);
register_taxonomy( 'directors', array(
'series',
'movie'
), $directors_args );
}
add_action( 'init', 'nf_register_taxonomies', 0 );}
I have a clue but I don't know what the problem is and how to solve it, my taxonomy name is "directors", if I rename it to "director" the problem will be solved. But I don't want to change the name of this taxonomy.
Does anyone know how to solve this problem?