It revealed a big bug in the TBG, and I’m afraid it was generating wrong tangents since ages.
So for you guys that are using the master, could you please try to regenrate tangents on your normal mapped models and see if it stills work / work better (it should).
Ok, I just did that. All my models are simple, so I’m not sure if I’m able to see any difference. Anyway, the scene looks good, so you did not ruined anything :). And it’s good to know that I’m using fixed one. Thank you.