If playing on 1.17 Pre-release 1, it is possible to create an infinite furnace by using a lava bucket as fuel and setting something to smelt, then logging out while that item is smelting. This creates a furnace that never runs out of fuel. Mojang, please fix. This is OP, especially in super smelters.
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duplicates 1
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Hello! The furnace fuel creates a graphical glitch that makes it appear infinite. It isn't really 🙂. That graphical glitch is reported here: MC-10025.