item_ labels do not work once registered in a post type

[ninetyninew]

Labels starting with prefix item_ from here:

​https://developer.wordpress.org/reference/functions/get_post_type_labels/

Are not used in the dashboard when registering them in a custom post type.

<?php
$labels = array(
        'name'                          => _x( 'Cars', 'Post Type General Name', 'abcde' ),
        'singular_name'                 => _x( 'Car', 'Post Type Singular Name', 'abcde' ),
        'menu_name'                     => __( 'Cars', 'abcde' ),
        'name_admin_bar'                => __( 'Car', 'abcde' ),
        'archives'                      => __( 'Car Archives', 'abcde' ),
        'attributes'                    => __( 'Car Attributes', 'abcde' ),
        'parent_item_colon'             => __( 'Parent Car:', 'abcde' ),
        'all_items'                     => __( 'All Cars', 'abcde' ),
        'add_new_item'                  => __( 'Add New Car', 'abcde' ),
        'add_new'                       => __( 'Add New', 'abcde' ),
        'new_item'                      => __( 'New Car', 'abcde' ),
        'edit_item'                     => __( 'Edit Car', 'abcde' ),
        'update_item'                   => __( 'Update Car', 'abcde' ),
        'view_item'                     => __( 'View Car', 'abcde' ),
        'view_items'                    => __( 'View Cars', 'abcde' ),
        'search_items'                  => __( 'Search Car', 'abcde' ),
        'not_found'                     => __( 'Not found', 'abcde' ),
        'not_found_in_trash'            => __( 'Not found in Trash', 'abcde' ),
        'featured_image'                => __( 'Initial Image', 'abcde' ),
        'set_featured_image'            => __( 'Set initial image', 'abcde' ),
        'remove_featured_image'         => __( 'Remove initial image', 'abcde' ),
        'use_featured_image'            => __( 'Use as initial image', 'abcde' ),
        'insert_into_item'              => __( 'Insert into Car', 'abcde' ),
        'uploaded_to_this_item'         => __( 'Uploaded to this Car', 'abcde' ),
        'items_list'                    => __( 'Cars list', 'abcde' ),
        'items_list_navigation'         => __( 'Cars list navigation', 'abcde' ),
        'filter_items_list'             => __( 'Filter Cars list', 'abcde' ),
        'item_published'                        => __( 'Car published', 'abcde' ),
        'item_published_privately'      => __( 'Car published privately', 'abcde' ),
        'item_reverted_to_draft'        => __( 'Car reverted to draft', 'abcde' ),
        'item_scheduled'                        => __( 'Car scheduled', 'abcde' ),
        'item_updated'                          => __( 'Car updated', 'abcde' ),
);
$capabilities = array(
        'edit_post'          => 'update_core',
        'read_post'          => 'update_core',
        'delete_post'        => 'update_core',
        'edit_posts'         => 'update_core',
        'edit_others_posts'  => 'update_core',
        'delete_posts'       => 'update_core',
        'publish_posts'      => 'update_core',
        'read_private_posts' => 'update_core'
);
$args = array(
        'label'                 => __( 'Car', 'abcde' ),
        'description'           => __( 'Post Type Description', 'abcde' ),
        'labels'                => $labels,
        'supports'              => array( 'title', 'thumbnail' ),
        'hierarchical'          => false,
        'public'                => false,
        'show_ui'               => true,
        'show_in_menu'          => true,
        'menu_position'         => 40,
        'menu_icon'             => 'dashicons-businessman',
        'show_in_admin_bar'     => true,
        'show_in_nav_menus'     => false,
        'can_export'            => true,
        'has_archive'           => false,
        'exclude_from_search'   => true,
        'publicly_queryable'    => false,
        'rewrite'               => false,
        'capabilities'          => $capabilities,
        'show_in_rest'          => false,
);
register_post_type( 'abcde_car', $args );

e.g. on post update the notice is Post updated. Not Car updated.

[SergeyBiryukov]

Hi there, welcome back to WordPress Trac! Thanks for the report.

It should probably be better documented, but item_published and other item_* labels are only used for post types that support block editor:

• 'supports' => array( ..., 'editor' )
• 'show_in_rest' => true

If the post type does not support editor, or only supports classic editor, these labels are indeed not used.

[ninetyninew]

I see, is there any reason why these couldn't be used in that scenario? I often see custom post types which are registered without the block editor support as they contain no content area at all - just meta boxes with fields to attach meta to the post type.

[SergeyBiryukov]

Good point, let's look into using these labels regardless of the post type's editor support.

At a glance, seems like they could be used in wp-admin/edit-form-advanced.php.