Mage did Not Spawn in Forest estate

We bought the Forest estate map from the villager to get the post mortem Drop from the magician. The Trip took us 45 min. As we arrived we explore the Villa and killed all the servants and search for the magician. We searched 30 min but didnt find anything. Normally a magician spawns allways in a forest estate there wasnt even the special room where the magician Can spawn. So the whole trip was for nothing.
I Think its a bug ans i want to report it.
I would be glad to get a answer.
Florian Flath