Overall I'm enjoying it but I'm surprised no one reported a bug that I can reproduce on any file, at least on my configuration (M1 Macbook running Ventura 13.6.4 / Mp3tag 1.8.13). My test files are Mp3, mainly with ID3v2.3 tags.
When I have lyrics in a file, if I change any tag of that file with Mp3tag and go back to Apple Music, the lyrics are displayed with a line break after each line. If I edit the lyrics in Music (just by adding a letter then erasing it for instance), lyrics are back to normal.
For instance, lyrics in Music before tag edition in Mp3tag:
Am I the only one affected by this bug? I find it hard to believe that nobody has seen this, but maybe there aren't many people using unsyncedlyrics?
I should point out that when I use other software to edit tags, such as Metadatics, I don't have the problem (on the files that cause the bug with Mp3tag).
I've just released Mp3tag for Mac v1.8.15, where I removed the normalization of linebreaks when reading ID3v2 frames USLT (UNSYNCEDLYRICS) and COMM (COMMENT) to prevent display problems in Music.app.
I've first (and originally) looked at the Get Info window of Music.app, where everything looks good. But View → Show Lyrics showed the problem you've mentioned.
