Dupe bug on open Shulkerbox in hopper Inventory

[sphings79]

If you put a shulker into the hopper Inventory and rightklick it it will be opened.
Also if you disable open in inventory.
If you wait a moment wit the opened shulker inventory until the item was transfered to a chest or what ever,
take out the items.
The shulker in the chest still has all the items.
If you are not fast enough to click just use a hopper circle ;)

[sphings79]

I've only enabled can place shulker and open in air.
everything else is disabled

[qScriitorul]

Hey sir, i saw your post and i can't figure it out ( the dupe bug ) .. can you add me on discord and help me a bit?

[Hutch79]

Hey sir, i saw your post and i can't figure it out ( the dupe bug ) .. can you add me on discord and help me a bit?

I highly discourage anyone to give detailed instructions about how to exploit any duplication bug.
Although this plugin had no commits since two years, it's still used on nearly 500 servers which are potential vulnerable to this exploit.