Issue: When blasting an item in the blast furnace, or smoking an item in the smoker, clicking a different recipe in the recipe book will replace the input from the player inventory and delete the existing input as well as any output items.
Example: I put 8 iron ore in the blast furnace and 1 coal. I blast 5 iron and then decide to quickly swap in gold ore through the recipe book. The 5 iron ingots are deleted and the remaining 3 ore are replaced by the gold ore from my inventory.
Confirmed. The normal furnace gives you back items in the output slot, the new ones do not