While signs, stairs, doors, planks, slabs, buttons, trapped doors, and pressure plates of warped and crimson wood can be used as fuel in a smoker, furnace, or blast furnace, fence, fence gate, stem, and stripped stem cannot.

Steps to recreate:

1) obtain any of the items listed above

2) attempt to shift-click or click and place them in the fuel slot of the furnace, smoker, or blast furnace