Have you included the User Kits?

And, unsure if it’s the correct answer, but there were always a few ‘hidden’ drum kits in previous Roland products to be able to play legacy SMF’s created for (if I remember correctly) the CM computer cards or something like that. Prior to GM being ratified, there were a variety of Roland kit latouts, and Roland included some of them but didn’t document them properly. No idea why…

BTW, the User kits aren’t specific to each Keyboard Part… you can assign them to any Part.