Handel Serse set poorly identified

I just “Identified” this set:

only to have all track display nuked. The artists were identified but other than that indentiication absolutely messed up the track display - it just vanished!
So I deleted the set and reinstalled it from a backup.

I have had the same issue with this set. I finally left it “unidentified” with generic track listings as shown on import:

I don’t think I have the patience to manually edit each track…