I had a bundle of various blacksmithing molds, but after the 1.21.92 update came in, they suddenly disappeared. It contained the Silence forge mold, enchanted golden apples, and other things that I had worked hard to collect.
I was playing with add-ons in other worlds and the game would suddenly crash a few times, so I wonder if that was the cause.
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We're tracking this issue at MCPE-187058, so this ticket is being resolved and linked as a duplicate.
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