Does MusicBee do anything different regarding how the tags - specifically genre - are written in m4a?
Music that I rip/convert with DBPoweramp (MP3tag as well) will show with a wrong genre on my Fiio X3. If I take those files and re-write the genre tag with MB, then the genre will show correctly.
I'm trying to find the difference to help streamline my tagging process - Fiio has stopped developing the firmware, so I'm stuck with workarounds.