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.
Fixed. (The original bug, not the update problem ;-) )
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 in a new beta release, 14334, released over the Update checker
Reproduced and prioritized.