Blight Settlers Object blocks monster to be killed

Reference ID: 1.163.628.206

Bug Description: Monsters in my case Blight Goliath + Blight Miner + Lantern Bearer are unkillable in Toxic Sewer to being blocked by an object, which doesnt allow to end the blight encounter. The object is blocked by seems to be the vein of the Settlers League Mechanic. Neither it can be damaged by towers or spells/attacks.