This just happened to me today. I used the forge once, during the fight with grim, and I retrieved the split armor mid battle.
At end of battle, Grym fell on the mold cover.
Now I can no longer open the mold to make a 2nd armor...I have 2nd ore, just now way to open the mold. THe mold eject lever says it wont budge (probably because mold housing is empty so there is nothign to eject).
When I mouse over or use ALT- key, the only things I can interact with is Grym, and the mold lever. There is also blood on the mold housing.
Grym is too heavy to move (5000 kg), and I have no desire to reload older save to replay the battle. The last patch for baldur 3 says it added fix to "allow player to use forge a 2nd time"...but that is not entirely true...you cannot use forge a second time if Grym fell on top of the mold housing.
This issue has been around for a couple of months, but I have not yet seen Larian acknowledge it is a problem.