Pools of Devotion Sometimes Show Up as Opposite State

Floofzy_Kitten

I notice that every now and again when playing Plague a Pool of Devotion will be highlighted by a white aura, but when I go to it it is visually clean, but I can drink from it. When I drink from it, it goes from clear to infected, then shortly afterwards it goes back to its' proper state (clean).

I don't know what causes this, but it happens when lots of survivors are cleansing at around the same time.