What do you mean by "Broken"? Can you not spawn it? Not equip it? Not cause it to fire? Not use it on any bricks? Not place the newly duplicated bricks?
My bad, forgot to explain that.
It registers that you duplicated it, and the ghost brick appears, but when you try to create it nothing happens. Then when you type /brickcount it registers the bricks but negatively.
So i dupicated 43 bricks and when I tried to create it nothing happened. And it said I had -43 bricks.