Hi Tony,
it’s only the description. The album identifications are still all there - about 85% of my albums. The descriptions just disappeared, but I am not sure which of my actions caused it. As I have stated, I had played around with Qobuz and noticed it afterwards. No idea whether this was the reason for it or something else…
I am using the Allmusic names in my file tags and I have composition set to “prefer file” in my library settings. Which gives me strange behaviour, too, as I described in this other post.