Has the phasing of enemy through the walls been captured as a bug?
I was just taking a look to build a mission, but after getting nailed by an AI who whoots me through the wall, or appears out of a tunnell end at random, i decided it wasnt worth it for now. Which is a shame as i love the feeling and ambiance of them.
Whenever you go into spectator mode, you can see a random portion of the AI are running around outside the tunnel network. Whether they spawned there, or phased there i dont know - but i can definately say i have experienced them phasing into the tunnels through the ends, and clipping inwards through the walls.