Went to smelt a stack of 8 gold ore in a furnace, and it would not smelt. The fire icon in the middle of the furnace won't light. Have tried smelting with coal and charcoal as fuel, and even tried smelting in a blast furnace. This bug also occurs for my friend playing on Xbone in my world. Stacks of 64 iron ore would smelt fine, and so would food.