Whenever a trident thrown by a player hits another mob or entity, it disappears entirely. The typical behaviour is that the trident will bounce off the mob it hits to be picked up again, or return to the player that threw it if enchanted with Loyalty. However, in either case, the trident vanishes as soon as damage is dealt to the entity it hit.
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I posted a report on the exact same issue, with a couple of video attachments.
I hope this gets fixed soon, because the trident is fairly useful! 🙂
I lost two of my tridents in my survival world, does anyone know if there's a way to get it back? Getting tridents in java sucks
appending to previous comment: I don't know if this matters, but I had just repaired the enchanted trident in question on an anvil by merging it with a mostly repaired non-enchanted trident. The resulting trident appeared to be what you would expect from this repair, but disappeared upon first use upon a drowned at point blank range.
I can confirm that this happens. Also happens when loyalty is enchanted on the item.