For the first time ever, I've managed to reach a Black Lotus Party mission before it despawns.
Man, that was a strange experience. The pathfinding of a large portion of the enemies was broken, perhaps even non-existent.
Many of them would just wander around inside the rooms they started in, never leaving it unless panicked.
Enemies on the upper floors seemed to be especially prone to this. I only really started to notice this behavior, once I've unveiled most of the map and started using motion trackers to find hidden enemies + I could see many of them through the glass ceilings on the roof.
Attached is a save file starting from near the beginning of the mission, if that helps.