I gained Iron Leggings with a durability level of 0. If this was an earlier version of the game this would be okay but Minecraft has made changes to the durability and made it so it breaks at 0 and not -1 durability.
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_This is only a visual bug and just makes it so it has less than 1 durability and isn't urgent
I checked if it had any unusual properties when it breaks and it doesn't.