That’s not a cheat spawn, if you can see them on the way in… although if they fall 20 feet that SHOULD make a sound. What this is … is they just blip in. I’ve seen it in exterior maps where I jumped down to a lower balcony and just before I landed 'POOF" 20 dreg shooters and two ogryn appear on that ledge.
Fair amount of video on the forums though.
This thread had several videos, but it looks like only one is functional for me at the moment… Teleporting enemies at my back in empty rooms
EDIT: Here’s one of the videos showing it. It’s bad enough in front, it’s worse behind. No more cheat spawns. You can skip to 7 seconds for the moment.