Description

Footnote numbers are incorrect when paragraphs are deleted and undone.

Step-by-step reproduction instructions

1. Set footnotes for each of several paragraphs.
2. Delete the first paragraph.
3. Undo.

Screenshots, screen recording, code snippet

Environment info

• WordPress 6.4.3
• Enable and disable Gutenberg 17.9.0

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