Hopperhock voids items

[emilyploszaj]

Hopperhocks will void items when the attempt to merge stacks. If a stack of an item it is picking up already exists in an inventory, the picked up item will simply disappear, unless the inventory stack is full, then it will make a new stack.

To reproduce:

• Place hopperhock next to a chest
• Drop a single grass block and wait for it to be picked up
• Drop a more grass blocks
• View chest