Hi gang! Now, this isn't a huge issue but I figured I'd report it anyway because for all I know it could be related to other stuff. You can use hotkeys (1-9) to swap stuff with your hotbar, I use this quite often. For example: I usually keep my torches in slot 5, so when I'm exploring a cave and I need light (OptiFine ftw!) I open my inventory, hover my mouse over my offhand (where I usually keep a shield at this time) and then press 5. Well, I noticed that if you try to do this with a shulker box (so: to take items out) then you always get an error about not being able to put voting keys in. Even if all I'm trying is to get my vanilla shield out. For full disclosure this is what's in the shulker box at this time: I was trying to grab my sword and put it into slot 1 (by pressing 1). Like I said; it's not a major issue but just something odd I just noticed. And thanks for your time! (edit) To reproduce: Put stuff into a shulker box. Close shulker box. Open it and then hover your mouse over an item and press 1 to 9.