In CM it is possible for both the player and enemy mobs to teleport through the floor/ceiling using infiltrators shot, shadow step etc. I was attempting to blink past the mobs with infiltrators shot to skip trash while soloing the dungeon on path one in the basement. I instead appeared in the entryway to the mansion and had 4 enemies suddenly appear from the sky and land next to me. The same ones I was trying to skip.
While I realize this is mostly dead content and nobody seems to give a crap about the old dungeons, I post this in hopes they will get some tlc at some point.
Issues at play here:
AI mobs should not be capable of teleporting or chasing all the way back to the beginning of the dungeon area. They should leash in instances like this.
The ceiling isnt properly sealed allowing players to teleport through it which seems undesirable at best and exploitable at worst.