So when I hit someone with chill who is hidden I never have to roll to attempt to break their hidden, I just roll hit di, the result is them being simultaneously advantaged and disadvantaged which apparently makes them roll 3 dice and they get to choose the highest result of all 3 which effectively means chill is buffing not debuffing them. I'm not sure if this is a 1 issue thing, obviously I shouldn't be able to hit a hidden target without breaking that, but also there are other ways to simultaneously be advantaged and disadvantaged on rolls that I haven't tried (eg battle cry fighter being hit by lock and load) that this could potentially also be effecting, seems like they should cancel out but can't say whether they do or not, probably worth at least checking, hope that's helpful :)