我有以下功能。我的自定义主题的php：

<?php
add_theme_support( \'post-thumbnails\' );
add_image_size( "main-slider", 671, 252, true );

add_action( \'init\', \'create_main_slider_post_type\' );
add_action( \'init\', \'create_external_link_post_type\' );

function create_main_slider_post_type() {
    register_post_type( \'main_slider_item\',
        array(
            \'labels\' => array(
                                  \'name\' => __( \'Main Slider Items\' ),
                                  \'singular_name\' => __( \'Main Slider Item\' ),
                                  \'menu_name\' => __( \'Main Slider\' )
                        ),
                        \'description\' => "A banner with a text and button",
                        \'public\' => false,
                        \'show_ui\' => true,
                        \'exclude_from_search\' => true,
                        \'show_in_nav_menus\' => false,
                        \'map_meta_cap\' => false,
                        \'supports\' => array(\'title\', \'thumbnail\'),
                        \'has_archive\' => false,
                        \'show_in_nav_menus\' => false,
        )
    );
}

function create_external_link_post_type() {
    register_post_type( \'external_link\',
        array(
            \'labels\' => array(
                                  \'name\' => __( \'External Links\' ),
                                  \'singular_name\' => __( \'External Link\' ),
                        ),
                        \'description\' => "A link with image for site footer",
                        \'public\' => false,
                        \'show_ui\' => true,
                        \'exclude_from_search\' => true,
                        \'show_in_nav_menus\' => false,
                        \'map_meta_cap\' => false,
                        \'supports\' => array(\'title\', \'thumbnail\'),
                        \'has_archive\' => false,
                        \'show_in_nav_menus\' => false,
        )
    );
}
?>

在“高级自定义字段”的配置中，main\\u slider\\u项作为“Post Type”的可能值消失了。（它仅显示“post”和“page”post内容类型。）它早就在那里了。

在哪里挖掘？

我试图禁用每个活动插件，但这没有帮助。