This issue can be recreated in any gamemode by naming an item such as a redstone torch or any placeable block and then placing it on the ground and breaking it, when you get the item back it returns the item with the default name (e.g. if you name a torch, place and then break it, the name will return to Redstone torch)
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Duplicate of MC-209, please use the search function to see if your bug has already been submitted. Currently over 58% of tickets are being resolved as duplicate.