Description

Inserter modal doesn't show patterns that contains other patterns.

Step-by-step reproduction instructions

1. Create a first pattern (will be our main pattern) and add it to your theme in /patterns/ (ex: test-pattern-1.php) :

<?php
/**
 * Title: Test pattern 1
 * Slug: abc/test-pattern-1
 * Categories: abc
 * Description: Test parent pattern issue
 * Keywords: test, parent, pattern
 * Block Types: core/post-content
 * Post Types: post, page
 * Inserter: true
 * Viewport Width: 1200
 * Source: theme
 */
?>
<!-- wp:pattern {"slug":"abc/test-pattern-2"} /-->

2. Create a second pattern (will be our inner pattern) and add it to your theme in /patterns/ (ex: test-pattern-2.php) :

<?php
/**
 * Title: Test pattern 2
 * Slug: abc/test-pattern-2
 * Categories: abc
 * Description: Test pattern issue
 * Keywords: test, pattern
 * Block Types: core/paragraph
 * Viewport Width: 1200
 * Source: theme
 */
?>
<!-- wp:paragraph -->
<p>My text paragraph</p>
<!-- /wp:paragraph -->

3. Go to Pages (or Posts), then click on "Add new"

4. Inserter modal should popup and allow you to select the pattern "Test pattern 1" but nothing happens:
   

5. Edit test-pattern-1.php to replace wp:pattern code with direct block code of test-pattern-2.php and save:

<?php
/**
 * Title: Test pattern 1
 * Slug: abc/test-pattern-1
 * Categories: abc
 * Description: Test pattern issue
 * Keywords: test, pattern
 * Block Types: core/post-content
 * Post Types: post, page
 * Inserter: true
 * Viewport Width: 1200
 * Source: theme
 */
?>
<!-- wp:paragraph -->
<p>My text paragraph</p>
<!-- /wp:paragraph -->

6. Go back to Pages (or Posts), then click on "Add new"
7. Inserter modal shows up:
   

Screenshots, screen recording, code snippet

Environment info

• WordPress: 6.4.3 (LTS)
• Gutenberg (same as WP 6.4.3)
• Browser: Chrome
• OS: Windows

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