Sulfur cube block interaction swaps the block instead of dropping it.

When a player or dispenser use an item on a sulfur cube that contains a block already, the block in the cube should be placed into the inventory/dispenser if there is room (like using a stack of compasses on a lodestone, the compass finds a slot to occupy. If there is 1 compass (or a water bucket), the same slot is used).

Currently, the item always drops from the sulfur cube, which makes automation much harder because you need a hopper and a dispenser to swap the block inside a sulfur cube.