Vaal Factory bug

When doing waystones in the Vaal Factory map layout, there's often a rare archer monster type that is stuck under the floor, resulting in the monster being un-targetable and thus unkillable. The rare monster being unkillable makes the map/waystone impossible to complete, requiring the player to re-run the map without any additional bonuses (i.e. irradiated, breach, etc).

same.