I was throwing around my trident in the North Pole area in the main world, and I randomly got 2 tridents. Unfortunately, I didn't think of taking a screenshot of this. I can confirm that the other said trident worked, as I was able to throw both of the tridents. They had the same name, enchants, durability, and everything. I disposed of the duped trident by throwing it into the ocean, but this glitch might be abused by other players to gain money, since tridents are worth about 30~50k.