Bug: core/post-content is stripped out of registered patterns blockTypes property for WPCOM sites

[triple0t]

Context and steps to reproduce

See p1737538662329279-slack-C03N25JPCE4 for more information.

Note: The issue does not affect blockTypes set to other blocks e.g., core/paragraph.

Replication
Required

1. Register a block pattern
2. Ensure you have blockTypes set on the pattern properties and ensure blockTypes = core/post-content
   e.g

register_block_pattern(
    'my-plugin/powered-by-wordpress',
    array(
        'title'      => __( 'Powered by WordPress', 'my-plugin' ),
        'blockTypes' => array( 'core/post-content' ), // NOTE
        'categories' => array(''),
        'content'    => '<!-- wp:paragraph {"backgroundColor":"black","textColor":"white"} -->
        <p class="has-white-color has-black-background-color has-text-color has-background">Powered by WordPress</p>
        <!-- /wp:paragraph -->',
    )
);

Optional

• Click on Add new post
• Open the block inserter,
• Locate patterns under "Uncategorized" or (the category specified in Step 1 above).
• Open the Web browser console and run this JS:

wp.data.select('core').getBlockPatterns().filter(( { name } ) => name.includes(`PATTERN_NAME_FROM_STEP_1`) ).

• Notice that the pattern has the blockType property set to an empty array ([]).

Site owner impact

No response

Severity

No response

What other impact(s) does this issue have?

No response

If a workaround is available, please outline it here.

No response

Platform

Simple

[github-actions]

OpenAI suggested the following labels for this issue:

• [Feature Group] Content Management: The issue relates to the management and functionality of block patterns within the content management system.
• [Feature] Block Patterns: The core of the issue is that the blockTypes property for block patterns is not being properly recognized for WPCOM sites.
• [Feature] Plugins: This issue likely impacts functionality related to third-party plugins that may utilize block patterns.

[triple0t]

@Automattic/lego -- Many thanks.

[jartes]

📌 ACTIONS

• Triaged

📌 Message to Author
@triple0t Thanks for reporting this! If this issue is already being worked on, remember to set it as triaged by removing the Needs Triage label, and adding the Triaged label. Also, set it as Triaged on the One Board project, and add the team :) Thank you!

[triple0t]

@triple0t Thanks for reporting this! If this issue is already being worked on, remember to set it as triaged by removing the Needs Triage label, and adding the Triaged label. Also, set it as Triaged on the One Board project, and add the team :) Thank you!

Thank you for adding the label, @jartes

The bug was fixed in Automattic/jetpack#41324

We can close this issue.