To reproduce:
Give yourself all recipes (/recipe give @p *), place a furnace, and open the recipe book
Right click the iron ingot recipe and observe that the alternative input options are displayed as an overlay (because these are separate recipes)
Try to right click the iron nugget recipe and observe that nothing happens (because this is one recipe with multiple inputs specified)
This also happens when the multiple inputs are specified as an item tag instead of as specific items, like it is the case for the charcoal recipe.
Hello, what is the expected outcome of this? Iron Nuggets can only be crafted by Iron Ingots. I think you mean to indicate that Iron Swords, Chainmail and other relevant items should be shown here, as they can be smelted. If this is correct, please add it to the description. Thanks! 🙂