I just tagged some Ogg Vorbis files with the advanced tag editor - and was shocked: almost all tags have been erased!!!
The same happens on FLAC files.
This does not happen when using the spreadsheet tag editor.
Reproduced and prioritized.
Fixed in a new beta release, 14334, released over the Update checker
It seems like we have a bug or technical issue in the update system which we are analysing parallell to this (no report needed). Thanks for notifying us about it.
Fixed. (The original bug, not the update problem ;-) )