Bight monsters stuck inside the crucible rock

During a blight encounter situated nearby to a completed crucible encounter, monsters from one lane got stuck inside the crucible rock-tower-thing and became unkillable, making the lane unable to be finished and the chest unclaimable.

Got the same error (actually did in a prior map as well). Crucible rock blocks the blight portal, hindering the spawn and thus making the blight encounter unable to complete. at least you can collect the other completed lanes

This seems to be an unfortunately common occurrence if these two events spawn near each other in the map. Here it's happened again in a Castle Ruins map, just now, stranding one chest and the overall rewards for completing the blight encounter. Completing the crucible encounter had no effect on the stuck, immortal creatures.