Re-pressurizing rooms is an uphill battle

[BaneOfGiygas]

I don't know if this is a quirk in the recently-shuffled atmos code or me just drastically underestimating how much effort these sort of things take, but recently, it seems next to outright impossible to refill rooms that have been vented to space with air, even if I drag in more than five full canisters of air into the area. All of it just enigmatically vanishes somehow, and leaves the area every bit as much of an airless void as it was before.