I see a problem with a key feature of MP3tag - the batch processing of a lot of files. There are numerous threads that deal with the problem of locked files.
And while the use case that you describe depends a lot on a setup that MP3tag cannot influence, I still think that the message that there are unsaved changes, which got introduced with 3.09
[2021-08-16] NEW: added option to disable notification message that warns about unsaved changes. (#53945)
should also be displayed when other interaction than navigation occurs. This would be in the scope of MP3tag's influence.