In clay crafting, there is a shape for the hammer head. During the game, when I extracted and spread out the right amount of copper, in the amount of 300 units, I noticed that I simply can not pour copper into the hammer shape. I thought I had a bug with the crucible, but I was able to safely pour the molten copper into other molds. I was able to make a pickaxe and other tools, but nothing is poured into the mold for the hammer head. Is this a bug, or did I just not understand some mechanics?