Summary:
All crimson and warped wood items except for signs and doors can be used as fuel in furnaces. This should not be the case as the woods cannot burn.

Steps to Reproduce:

1. Place a furnace.
2. Open the furnace and place any crimson or warped wood item except for signs and doors in the fuel slot.
3. Place a smeltable item in the smelting slot.

Observed Results:
The wood item powers the furnace and the item starts smelting.

Expected Results:
The crimson and warped wood items should not be able to be placed into the furnace.