Re: Unable to progress on Unit 2
Unfortunately, I like to hoard the max health and max ammo boosts stuff like Adrenaline and Ammo Packs give you, and those aren't stored if you have to teleport out, so while it works, it's not always an ideal situation.
I've also had it happen when not using Andrei mode, so it seems to be an issue with CoopOrDie itself, not just the additional monsters (though the extra monsters may make the bug itself more likely to happen).
A more hilarious occurrence has come up outside of Andrei mode - during a standard challenge run with metal I had the spawn bug happen late in the game (jail unit, inner courts), except that it was player corpses and chunks of rocks/gore spawning inside me! Had it happen about three times, he had to shoot 'em off me so I could see.