Something I’ve found in my playthrough, let’s see, how to explain. When roasting clay molds in the furnace, if you leave one in the output, say an axe ceramic mold, and enter a different clay mold in the input, say an ingot clay mold. It’ll cook it and you end up with two axe ceramic molds. Are yo…

Oh fuck I just realized, the Molds use NBT specifically, so that is the reason it happens, not metadata… I do not think that one is fixable, sorry.