Beast folk on back to uber maps. specifically horn of ;aksjf;aslkj

This is also an issue in the Shadows over Bogenhafen DLC maps. You can even see Beastmen hanging around sewers with the Skaven. (Which makes no sense.)

Yes, since:

Beastmen don’t like hanging around in cities like Ubersreik and Bogenhafen. Even if the Back to Ubersreik maps are supposed to be an illusion, the illusion still has to make sense.

Also, Olesya only acknowledges the presence of the “Pactsworn” in the map. Beastmen were never part of the Skaven-Chaos Northmen pact.