Description

Using GB 16.7 RC 2 and WordPress 6.3.1 OR 6.4-alpha-56670, I'm unable to create an unsynced pattern. When I deselect the sync option, a synced pattern is still created. cc @aaronrobertshaw.

Step-by-step reproduction instructions

1. Open the Site editor.
2. Head to Pages.
3. Open a page.
4. Create some blocks.
5. Select those blocks and use the three dot menu to create a pattern in the Site Editor.
6. Add a category.
7. Turn off the sync option.
8. Notice the snackbar notif says unsynced pattern created but notice a synced pattern shows up both in the inserter and on the page itself.

Screenshots, screen recording, code snippet

Here's a short vid showing the problem at its simplest:

Here's me talking through the bugginess as I'm not quite sure how best to explain it otherwise! Basically the "syncness" seems to not stick and randomly ignore sync status.

Environment info

• 6.3.1 and 6.4-alpha-56670
• GB 16.7 RC 2

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