I don't get why anyone cares about this, fire's ability to pass through these walls has been there forever. Things that aren't broken don't get fixed unless they destroy the aesthetic of the game.
If someone still has a problem with this, think the FIRE element as if it was the remains of the material still burning, while the air currency is lifting them up.
there are currently 3 different state veriables, I don't know why. I plan to eventually combine them all, into either just 1 or 2. If I do that, this would probably be fixed, or I can add a specific exception so it isn't ... I don't know how many saves use this bug.