Hi there @zefrank, was your inventory full, maybe it fell to the ground? Are you able to replicate this, or did it just happen once?I had a Mime Mask on a mannequin and when I used my pickaxe to take it off the mannequin it disappeared.
If you haven’t already, I recommend sending this info straight to Pipeworks, the console developers, here: Terraria: Console & Mobile Bug FormNo, inventory was empty, nothing on ground. Just tried again, same result.