Anything with Vivaldi’s 4 seasons on is a good test (it’s doubly complicated in having 2 separate parent works). E.g. this one When imported into Muso, it looks like this:
I’m not sure if or how you can replicate that multi-level appearance in MusicBee, but the tags should all be available. Note that the two-level tagging uses a double colon to separate 2 levels in a single tag, or you can use the hidden variables. (I assume you use the “View script variables” plugin to view the hidden variables.) If it still doesn’t work, I’d need to look at your option settings.
The Brandenburg concertos are also a good test. E.g. this release. (BTW I’ve found that the new movementnumber tag can get out of sequence on this one - I’m still investigating).