I have noticed that Audirvana messes the genres if there is multiple genres in file:
This is original genre at file:
FBPM=132.9999GENRE=Alternative RockGENRE=Indie Rock
This is same file after replay gain calculation with audirvana.
FBPM=132.9999!GENRE=Alternative Rock Indie Rock
This genre value is valid, but it is not two genres “Alternative Rock” and “Indie Rock”
it is just new genre called “Alternative Rock Indie Rock”
I noticed this at Roon when there started to appear a lot of new strange genres.