There are maybee 100-120 tagging standards in that Re-encode option, and I tried 60 of these but none was successful.
Within MusicBee everything is showed correct, but it goes wrong during exporting the m3u playlist to the Sonos app.
The image you see is a screencapture from the Sonos app.
I let you know that I had the same problem with Mediamonkey, until I unchecked in the settings an option like this : "use unicode(utf-8 encoding) for .m3u playlist. After doing this it was OK. Apparently tagging is different for library as well as for playlists ?
JRiver, MP3Tag, Winamp, Aimp were OK
for Steven : changing the tagging option in MB to "ID3v2.3ascii only" is that what you mean. I already did that before, but I am not aware whether anything happened at that moment.
thanks for your attention
about the picture :
what you should read is
Jägerlied aus dem Freischütz - Günther Wewel.mp3
Tränen der Liebe - Ernst Hutter & Egerländer Musikanten.mp3