Listing multidisc albums with different composers

[Uoppi]

In post #3 above, there's a screenshot where the separately listed album/disc has a single consistent ARTIST across all tracks.

In this post's attachment, there's a screenshot of where the issue is fixed by adding a single character ("1") at the end of the ARTIST field on one of the disc's tracks, resulting in the disc having multiple ARTIST values. (Hence displayed as "Iona Brown1".)

In both cases, ALBUMARTIST is a single global value across the whole set (composer names separated by a semicolon).

EDIT: What is interesting is that deliberately changing ARTIST to be dissimilar on one track in Ronald Brautigam's Beethoven 10-disc set does not cause any issues. Which makes me wonder if the sheer amount of metadata in the Heinz Holliger Edition's case is somehow a problem (versus just having one composer and one artist across the whole set, e.g. Beethoven + Brautigam).