我添加了分类法和自定义帖子类型，但由于某种原因，在添加新标记时，我的分类法没有显示出来。我有点期待它会出现，就像在为一篇文章选择一个类别时一样，但事实并非如此。有什么想法吗？

function register_mm_post_types()
{
    register_taxonomy(\'marker_types\', 
        array(\'markers\'), 
        array(
        \'labels\'            => array(
            \'name\'              => __(\'Marker type\', \'moxxie\'),
            \'singular_name\'     => __(\'Marker type\', \'moxxie\'),
            \'search_items\'      => __(\'Search marker types\', \'moxxie\'),
            \'all_items\'         => __(\'All marker types\', \'moxxie\'),
            \'parent_item\'       => __(\'Parent marker type\', \'moxxie\'),
            \'parent_item_colon\' => __(\'Parent marker type:\', \'moxxie\'),
            \'edit_item\'         => __(\'Edit marker type\', \'moxxie\'), 
            \'update_item\'       => __(\'Update marker type\', \'moxxie\'),
            \'add_new_item\'      => __(\'Add new marker type\', \'moxxie\'),
            \'new_item_name\'     => __(\'New marker type name\', \'moxxie\'),
            \'menu_name\'         => __(\'Marker types\', \'moxxie\')
        ),

        \'show_ui\'           => true,
        \'query_var\'         => true,
        \'hierarchical\'      => true,
        \'show_admin_column\' => true,
        \'rewrite\'           => array(\'slug\' => \'marker_types\')
    ));

    register_post_type(\'markers\', 
        array(  \'taxonomies\'            => array(\'marker_types\'),
                \'labels\'                => array(
                    \'name\'                  => __(\'Map markers\', \'moxxie\'),
                    \'singular_name\'         => __(\'Marker\', \'moxxie\'),
                    \'add_new\'               => __(\'Add a new marker\', \'moxxie\'),
                    \'edit_item\'             => __(\'Edit marker\', \'moxxie\'),
                    \'new_item\'              => __(\'New marker\', \'moxxie\'),
                    \'view_item\'             => __(\'View marker\', \'moxxie\'),
                    \'search_items\'          => __(\'Search in maps\', \'moxxie\'),
                    \'not_found\'             => __(\'No markers found\', \'moxxie\'),
                    \'not_found_in_trash\'    => __(\'No markers found in trash\', \'moxxie\')
                ),

                \'has_archive\'           => true,
                \'show_in_rest\'          => true,
                \'hierarchical\'          => true,
                \'public\'                => true,
                \'menu_icon\'             => \'dashicons-location\',
                \'capability_type\'       => \'post\'
    ));
}
add_action(\'init\', \'register_mm_post_types\', 1);