Description

When registering a new pattern category with / as per Developer Docs, i.e themeslug/custom and when I select "Add new pattern" and select the category from the list, the slug is themeslug-custom which is a new category(duplicate) with same Name.

This has been reported in Trac Ticket; as per suggestion reporting the issue here.

Step-by-step reproduction instructions

1. Register a block pattern category and pattern as per docs,

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' )
	) );
}

Now try adding the themeslug/custom category to any block pattern:

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

2. Go to Appearance > Editor > Patterns and select the specific pattern (the slug is themeslug%2Fcustom)
3. Select "Add new pattern" or Duplicate any existing pattern
4. And select Theme Name: Custom category from the list,
   • The pattern will have a new category assigned and the slug will be themeslug-custom
   • Will have two categories with the same name but with different slugs.

Screenshots, screen recording, code snippet

Environment info

• WordPress: 6.8-alpha
• Theme: Twenty Twenty-Four

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure