At the present time, the new music agent doesn’t deal very well at all with albums by multiple artists. It will invariably match the album to the first artist in the tag. They’ve hinted they are working on a fix…
Any way, the only solution I found was to “Split Apart” at the artist level. If I remember correctly, you end up with two artists with the same name. You then correct the artist name that’s wrong to have both names, and then match the album manually.
You probably won’t have any bio info, but the album should match up with the reviews and any other goodies the new system gives us.
There might be other ways to do it here: