Issue debugged with @tyxla.

When duplicating a page, no revision is created by default. That means that when saving the first edit, the Revisions field doesn't show up. It's only displayed once the second edit is saved.

Step-by-step reproduction instructions

1. Go to Appearance > Editor > Pages.
2. Duplicate one page.
3. Make one edit and save.
4. In the Page panel, notice there is no Revisions field.
5. Make a second edit and save again.
6. Notice the Revisions field is visible.

Expected result: in step 4, the revisions field should already be visible.

Screenshots, screen recording, code snippet

Environment info

• WordPress 6.9.1.

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