如何在自定义管理菜单下显示自定义分类？

我无法在“自定义管理”菜单下显示自定义分类法。自定义帖子类型正确显示，但分类法不显示。

我添加了自定义帖子类型：\'show_in_menu\' => \'my-menu\'

My Custom Menu

Custom Post Type 1
Custom Post Type 2
Custom Post Type 3
Custom Taxonomy that can be used by Post Type 1/2/3

显示自定义分类法需要做什么？

UPDATE

这是我的代码：

function create_custom_admin_menu() {
  add_menu_page(
    \'My Menu\',
    \'My Menu\',
    \'read\',
    \'my-menu\',
    \'\',
    \'dashicons-admin-page\',
    10
  );
}
add_action( \'admin_menu\', \'create_custom_admin_menu\' );


function create_custom_post_type_1() {
  $labels = array(
    \'name\' => _x( \'Custom Post 1\' ),
    \'singular_name\' => _x( \'Custom Post 1\' ),
    \'menu_name\' => __( \'Custom Post 1\' ),
  );
  register_post_type( \'custom-post-type-1\', array(
    \'labels\' => $labels,
    \'has_archive\' => false,
    \'public\' => true,
    \'show_in_menu\' => \'my-menu\',
    \'supports\' => array( \'title\', \'editor\', \'auther\', \'excerpt\', \'custom-fields\', \'thumbnail\',\'comments\' ),
    \'taxonomies\' => array( \'custom-taxonomy\' ),
    \'exclude_from_search\' => false,
    \'capability_type\' => \'post\',
    )
  );
}
add_action( \'init\', \'create_custom_post_type_1\' );


function register_custom_taxonomy() {
  $labels = array(
    \'name\' => _x( \'Custom Taxonomy\'),
    \'singular_name\' => _x( \'Custom Taxonomy\' ),
    \'menu_name\' => __( \'Custom Taxonomy\' ),
  );
  register_taxonomy( \'custom-taxonomy\', \'my-menu\', array(
    \'hierarchical\' => true,
    \'labels\' => $labels,
    \'query_var\' => true,
    \'show_admin_column\' => true
  ) );
}
add_action( \'init\', \'register_custom_taxonomy\' );

UPDATE 2

我尝试了所有的方法，但没有任何效果：

register_taxonomy( \'custom-taxonomy\', \'my-menu\', [...]


register_taxonomy( \'custom-taxonomy\', \'custom-post-type-1\', [...]


register_taxonomy( \'custom-taxonomy\', array(\'custom-post-type-1\', \'custom-post-type-2\', \'custom-post-type-3\' ), [...]

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