Fix Duping by disabling shulker opening in Hotbar / Offhand

[aria1th]

Proper fix should be mixin into InteractionManager, and prevent further useBlock action while it was processing Screen exchange.

[kyrptonaught]

This disables the shulker from being opened from the hotbar or offhand? That's kind of removing a core feature IMO. I think the duping was mostly mitigated to just creative only. There are checks now to make sure the item still exists where it was supposed to be before allowing you use the opened shulker, this removed the dupe from survivial now.

I do agree about the proper fix, just unsure about how to do it. The fix needs to be server sided, else the client could just not update or modify the jar. The server would have to ignore the clients place block/interact block packets while the opened shulker is being opened.