If you add a new genre only to non-primary versions of an album then it is not shown in the new Subgenre.
example - I added Ambient and Score to the Monster soundtrack (was formerly Chilled Electronica) bit only the 5.1 Versions - The main version is still just Chilled Electronica.
The new genre appears with a “No albums yet” message.
I CAN search for the album under other Genres where I have added it, but it doesn’t appear by default.
It feels like, for where things sit, all Genres for all Versions should be taken together as a single item?