I can’t imagine I’m in a tiny minority by tagging .m4a files with Picard, but it’s giving me a lot of trouble. Part of it is related to Picard 1098 and the fact that custom tags aren’t shown or saved for m4a files. (Which originated with this post 2 years ago.)
It also appears that performers just aren’t tagged for m4a - is that correct?
I’m still trying to sort out some kind of issue where the file shows correct artists in Picard, but MusicBee can’t see an artist value at all. Sometimes it’s fine but it’s happening consistently enough that I need to figure out what’s going on. It also seems like in these cases Picard is removing custom tags even without “clear existing tags” checked. If I can narrow down steps, I’ll make a ticket for it, but for now just seeing if anybody else has run into these kinds of troubles and if there’s anything I can do about it.