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Bug
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Resolution: Invalid
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None
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Minecraft 1.13.2
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None
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Unconfirmed
I searched and read through a few dozen reports looking for this issue but cant find it.
TL;DR Placing items in trap chest with hopper below while using 'silent chest/vanish' causes Duplications.
When you are using the /vanish mode a Moderator gets on a server you have the "Silent Chests" that allow you to open chests with no sound or animation. The bug comes from this involving Trap Chests, When you are using a trap chest since it gives a redstone signal it blocks hoppers when open so if you place items into it with a hopper below to trash any items left inside when you close it (trashcan machine) they will not flow into the hopper while its open. When in Vanish and using silent chest the redstone doesn't activate and the hopper pulls the items out as normal however the server also registers that its a trap chest and while the items are flowing into the hopper the items are also staying in the chest while you look inside (If you remove these items or move anything in the window it will register the items again and flow into the hopper more) you can then remove these items from the chest and look in the hopper to find duplicates, Using a hopper minecart speeds up this process and you can dupe anything.
Didn't include any pictures because I don't have access to make them atm and its rather idiot proof to reproduce.