Description

Enabling custom fields panel or adding a custom panel via add_meta_box causes post to always have "update" button enabled.

Step-by-step reproduction instructions

1. add new post
2. save new post
3. click update button forever.

Screenshots, screen recording, code snippet

https://www.screencast.com/t/s9r4xJO93seE

Environment info

• wordpress 6.1.1, no plugins installed

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