I made some tags in MP3TAG 2.32a.
Closed MP3TAG and listened to the files in foobar.
A day or so passed and the tags are now only visible in foobar and not in MP3TAG
(I say 'a day or so passed' to indicate that I do not know what other actions may have been performed on the files)
ID3v2 and 1 are selected for both programmes. APE are stripped.