I am hitting repeated problems where I have a lot of recordings of the same work and only a portion show in the composition view.
It could be non main stream labels etc not being ID’ed. The big problem is if you have 31 versions of a work , you can miss one without really noticing BUT it doesn’t make it right.
I am also seeing the composition in 2 formats eg
Piano Sonata No.1 in F Minor Op.2/1
and
Piano Sonata No.1 Op.2/1 in F Minor
Hence a mismatch
Mike