This bug is activated by double-tapping to remove all items from the furnace output slot. Once the double-tap is performed, the bug has activated consistently.

When the bug activates, no more items can be placed in the input or fuel slots of the furnace. Additionally, no more items can be removed from the output slot, and items cannot be moved from one inventory slot to another. However, the furnace will continue smelting items as normal, and the names of items will appear as normal when tapping them.

The same issues apply to the smoker. I did not test the blast furnace.