Aww, already did that. I guess I'll combine
even more entities then, but only where it won't be harmful. Still, I don't know what else to combine. And I still need a few more entities
Compiling once again...
Update.
Got it to load the map, but it still crashes with that message after a few minutes of testing. Blind guess, but I'd venture it's caused by self-recursive multimanagers. I'd assume they create a copy of themselves to (re-)call, eventually filling up and overflowing the call/entity stack. So I'd suppose that
any map with a self-recursive multimanager will crash with this error given enough time, therefore Valve's original implementation of multimanagers is faulty. That means I have found a bug in the game engine!
Wait, that's not good.