Hey there.
That is a weird thing to randomly have happen after the update, since I don't think I've changed much about the skyrim-like additive traits mode since I put it in. It does sound like it's holding on to the traits of the old result item instead of clearing, though, so you might be onto something. I'm curious to see what other traits it might hold on to in this case, lol.
I'll see if I can reproduce the problem, and then work on a fix for it.
-Ramza