To reproduce the issue follow this steps -

1. add a new work to BB followed by clicking on submit
2. visit the newly created work and then click on edit.
3. The edit page opens, try to submit the edit page without any revised details
4. The revision is accepted without any actual update to the work.

The part of the code the should be responsible for preventing that is here:
https://github.com/bookbrainz/bookbrainz-site/blob/07fd0f62bda21146d466c7fbcc06e20bcd10237c/src/server/routes/entity/entity.js#L704-L707