Final Level: Raiding Parties stuck on gate

Final Level (Main Campaign)

Raiding parties sent out by the king get stuck on their main gate (in the left and right corners, possibly somekind of waypointing/pathfinding error?).

As a result the king has sent out 4 raiding parties, none of them have been killed, they are all bunched up in a pile at the main gate.

Confirmed this in another friends game as well.