I agree that pick block shouldn't work when you use it on a box with items inside and only have empty ones in your inventory, but if both are empty then this behaviour seems inconsistent. If I pick block on a full shulker box of sand I'd expect another one in my inventory to get equipped too.
Also, the shift-double clicking trick to move many stacks of the same item between your inventory and a container works with shulker boxes as far as I've seen (and respects their contents or lack thereof).
Jonathan Harris
I agree that pick block shouldn't work when you use it on a box with items inside and only have empty ones in your inventory, but if both are empty then this behaviour seems inconsistent. If I pick block on a full shulker box of sand I'd expect another one in my inventory to get equipped too.
Also, the shift-double clicking trick to move many stacks of the same item between your inventory and a container works with shulker boxes as far as I've seen (and respects their contents or lack thereof).