Better Shulker Boxes 2.14.2 - Old paper build dupe fix
Changes in version 2.14.2:
Fixed a duplication bug that only occurs in old 1.15 builds of paper. For some reason, in old builds of paper, the inventory close event is not called when a player goes through a portal, this allowed players to throw themselves to an end portal from certain height, opening the shulker box and throwing items mid-air, when teleporting to the end, they shulkerbox would close without saving the changes, essentialy duplicating the items.