Shortcode Block not working in Synched Pattern in Template

[krokodok]

Description

The Shortcode Block does not parse shortcodes when used in Synched Patterns in Block Editor Page Templates.

Step-by-step reproduction instructions

1. Go to a blank page and insert the Shortcode Block into the content. I used this shortcode for testing: [caption]Caption[/caption]
2. Duplicate the block and transform it to a Synched Pattern.
3. Go to the frontend and observe both blocks working from inside the page content.
4. Now cut both blocks to the clipboard and navigate to the page template. Insert the blocks somewhere.
5. Go to the frontend and observe only the block working, that it is not a Synched Pattern. The other displays the raw shortcode content without rendering.

Screenshots, screen recording, code snippet

Environment info

I used WordPress Playground with theme Twenty Twenty-Five, WordPress version 6.7.1 and Php 8.0.

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

[Rishit30G]

I can confirm that the issue is there, sharing a screencast:
https://github.com/user-attachments/assets/b7b31ae6-0819-46e2-88c2-802775147d52

[talldan]

You can add the shortcode to a template part instead of a synced pattern to work around this.

I think shortcode processing was never added to synced patterns (or before that reusable blocks) as they were more commonly added to posts, and the code that renders a post already performs shortcode processing on behalf of all the blocks within the post.