PaperMC/paper-server/nms-patches/net/minecraft/world/inventory/SlotFurnaceResult.patch

--- a/net/minecraft/world/inventory/SlotFurnaceResult.java
+++ b/net/minecraft/world/inventory/SlotFurnaceResult.java
@@ -54,7 +54,7 @@
             if (iinventory instanceof TileEntityFurnace) {
                 TileEntityFurnace tileentityfurnace = (TileEntityFurnace) iinventory;
 
-                tileentityfurnace.awardUsedRecipesAndPopExperience(entityplayer);
+                tileentityfurnace.awardUsedRecipesAndPopExperience(entityplayer, itemstack, this.removeCount); // CraftBukkit
             }
         }