Broken Recipes with plugin created Furnace Inventories

The Issue
I currently have the problem that I cannot fix, my plugin opens a furnace inventory for the player when they click a certain block.

I have created my own recipes and they don't work with these furnace inventories! I really need to know how to fix this. If you even try to attempt any of the vanilla recipes like trying to smelt gold it just doesn't do anything, the items just sit there in the furnace not being smelted.

Creating the recipes:

Code:

//Adds the furnace recipes to the server
 
Server.addRecipe(new FurnaceRecipe(new ItemStack(IronIngot), Material.IRON_ORE));
Server.addRecipe(new FurnaceRecipe(new ItemStack(CookedMeat), Material.RAW_BEEF));
Server.addRecipe(new FurnaceRecipe(new ItemStack(CookedFish), Material.RAW_FISH));

Opening a furnace inventory for the player:

Code:

//onPlayerInteractEvent
//Click Stone for Example
 
if(Block.getType().equals(Material.STONE)) {
                     
    Event.setCancelled(true);
             
    Inventory FurnaceMenu = Bukkit.createInventory(Player, InventoryType.FURNACE);
             
    Player.openInventory(FurnaceMenu);                   
}