Is Mp3TAG safe?

I read the changelog and stumbled over


How about MP3?

Does MP3Tag also preserve uknown MP3 metadata (tag data) when writing tags?
Or are scenarios possible in which MP3Tag discards metadata it does not understand and is thus not a safe program?


There is at least one instance where MP3Tag deletes unknown MP3 metadata: lyrics3 and lyrics3v2

This isn't exactly confidence-building regarding the promise that MP3Tag wouldn't do the same thing with other metadata unknown to MP3Tag.

Why is this issue not being addressed?