Furnace fuel indicator incorrect on chunk unload

When smelting items in furnaces, the fuel indicator usually slowly goes down until there is no fuel remaining and the furnace stops smelting. If you unload the chunk that the furnace is smelting in, the fuel will still slowly be used up, but this is not reflected on the fuel indicator.

Upon unloading the chunk, the indicator goes back to full and does not change from that state until the fuel runs out.