In my plugin, I am creating an itemstack, converting it into an NMS-Copy, and then writing NBT Tags to it. When I use World#DropItem and drop a Bukkit-Copy of the NMS-ItemStack, the item only keeps the NBT data concerning its Custom Name and Lore. The problem is, the tags "custom data" about different players gets lost it seems. After I pickup the item, the plugin claims the ItemStack has no tags on it (nmsStack.hasTag() returns false). Is this because the data I stored isn't pertaining to any data from built-in NMS data? If so, how can I store any information that i want without losing it?