You know those gas clouds that come from Firestarter Chem Launcher, Cleaner Throwers and appear in Stranded Tanker? Those that catch on fire when fire or sparks enters the area? They explode when you shoot weapons inside of them, because of the muzzle flash, but I also noticed they explode when you fire the Survivalist crossbow inside. Not stick the bolt and let it explode, but when you release the bolt and let it fly outside the radius. It lights up like when using any other gun. It don't think that's supposed to happen.
I am not sure but I can try and recreate this on my game and report back if you wish. I haven’t use the crossbow in a long time. Been playing gunner to fully unlock its tree (I am 2 points away from completing all specialized weapon trees, can’t wait not that I ever use the specialized weapons but I like the different perks you get from them)
And just to be clear are you firing inside the gas or firing into other in the gas?