Double-clicking output slot of furnace throws items away

When the output slot of a furnace contains an item, and the slot is double-clicked, the item is thrown away rather than transferred to player inventory.

Steps:

1. Bake something in a furnace, wait for it to finish.

2. Ensure that you have free inventory slots, then double-click the output item in the furnace.

Expected: Item transferred to inventory (as with removing from a chest, etc.)

Actual: Item is thrown on the ground.