The issue does seem to be fixed somewhat, but I still have a few albums which are refusing to populate even with a manual metadata refresh. Where’s this metadata coming from? The remaining problem albums for me have MusicBrainz data but don’t seem to have complete Last.fm information.
Update: After some of the track artists cycled through different values, I ended up removing and re-adding a few of the albums which seems to have corrected the remaining issues.