Description

Possibly related to #62326

When a pattern created in a Block Theme with a full-width block is inserted in a page or post after switching to a Classic Theme, the full-width block in the pattern will display in content width in the editor. It maintains the correct alignment on the front end, though.

Step-by-step reproduction instructions

1. Activate TT4
2. Create a Pattern with a Cover Block with full-width alignment
3. Switch theme to TT1
4. Insert the patter in a post or page
5. The editor will display the Cover Block in the pattern as if it had no alignment, while the front end will display the correct alignmentpattern

Screenshots, screen recording, code snippet

Environment info

• WordPress 6.6 Beta 2
• Gutenberg 18.5

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