(... i kept title non-specific, maybe other dungeons are affected too?)

In this case: water treatment, DoY sector 9
reset position is in the center of the map instead of the (safer) entry.
In the middle of the map you very likely will face several 120/120 mobs. That position might only work if the dungeon is cleared already.

I ran into this with having an almost black screen after trying to hack an underwater hackbox (wich is not hackable because its underwater :P) - but I was still able to see chat and therefore preferred to set reset position. Bad idea .....