Saturn/Telesto (Extermination) Disabling alarm doesn't mean I don't want to finish the mission

[lainverse]

Enemies just stopped spawning at all. I returned to spawn and back to exit again, but nothing spawned. Mission was started in invite-only mode and I've disabled 1 or 2 alarms on the way. That should've prevented more enemies to spawn on top of what is usually there, but it shouldn't have completely blocked them spawning. Half of the map end up unpopulated and bare.

I can upload in-game screenshot with metadata if it may help.