register new pattern catogory possible docs bug

[backit]

Hi,
in
​https://developer.wordpress.org/themes/patterns/registering-patterns/#pattern-categories
the code to register a new pattern category does not work. Instead of "themeslug/custom" should be "themeslug_custom" both in functions.php and pattern file.
functions.php

<?php
add_action( 'init', 'themeslug_register_pattern_categories' );

function themeslug_register_pattern_categories() {
        register_block_pattern_category( 'themeslug_custom', array( 
                'label'       => __( 'Theme Name: Custom', 'themeslug' ),
                'description' => __( 'Custom patterns for Theme Name.', 'themeslug' )
        ) );
}

pattern file:

<?php
/**
 * Title: Hero
 * Slug: themeslug/hero
 * Categories: featured, themeslug_custom
 */
?>
<!-- Your block markup goes here. -->

Hope this is the right place (i did not find a bug document specific place)
Best regards.

[poena]

Hi @backit and welcome to the WordPress Trac!

Can you please reply with a more detailed description of what is not working?

When I copy paste the code in the example, the pattern category does exist and my pattern has the correct category name.

But if I go to Appearance > Editor > Patterns and select the specific pattern, the slug is themeslug%2Fcustom
If I duplicate the pattern, the slug is themeslug-custom.
If I select "Add new pattern" and select the category from the list, the slug is themeslug-custom

So I end up with patterns in two categories with the same name but with different slugs.

Using a prefix as part of a unique identifier is valid. I don't think that this is a documentation issue but a bug in the Site Editor.

If this is the case, then a new issue needs to be opened in the Gutenberg GitHub repository, and this ticket should then be closed.