Description

This is a similar issue to what we saw in the 6.2 beta, #48391, and it's reproducible again in 6.2.2 – I'm not sure if it came back in 6.2.1, but it was fixed and confirmed fixed when the initial 6.2 release happened. I just noticed it again.

Step-by-step reproduction instructions

1. Activate a classic theme with theme.json and support for block template parts that includes at least one block template part. (happy to provide an example theme if needed)
2. Go to Appearance > Template Parts
3. Click on the back button for All Template Parts
4. See the loading screen where the homepage should be – this page shouldn't exist for hybrid themes, from my understanding, it should go straight back to the dashboard.

Screenshots, screen recording, code snippet

Without Gutenberg

With Gutenberg 15.9.1

Environment info

• WordPress 6.2.2
• Tested with AND without Gutenberg 15.9.1

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