Maybe this has been brought up before and idk if it supposed to be like this or not. If you're in Ace and you get trapped, the fumes or whatever can't KO you. Which I think they're supposed to? That's how it works on that map in legends anyway right? Kinda dumb if you get trapped in there and just gotta stand there til the node changes. Good way to ruin a match also. What, you have to remove all you're gear or something I suppose? Even then, would it do anything?
I would assume it is a bug, since they used to kill you back in the day. It has something to do with the stats.
What role were you in? It sounds like you were healing faster than the gas was damaging you. This has happened for a while in certain instances. Depending on what role, buffs, shields or other things you had on yourself at the time.
LOL, that's what I figured. It happens to me when I'm on one of my tanks in PVP. I just take off some gear when I'm not going down.