Stun Trap + Flying creature causing ground-based creature to fall off the map and return invisible

[Kemen]

I was playing with the Tinkerer's stun trap by laying it in a doorway. A flying monster moved over top of the trap; then a ground based monster attempted to move through the trap, stunning it in the same location as the flying creature. The creature disappeared to a 'blue-grey' area off the map. Then turns later reappeared walking alongside the map but still in the space with the stun trap. As far as I know the AI targeting mechanic in the board game wouldn't allow for 2 monsters to end their turns in the same location, so the presence of a flying monster on a stun trap would work like an obstacle, similar to how the diviner's immobilize rift would work.

I'm also having issues with characters moving and teleporting in weird ways when opening doors with this most resent patch.