PaperMC/nms-patches/FurnaceRecipe.patch

--- a/net/minecraft/server/FurnaceRecipe.java
+++ b/net/minecraft/server/FurnaceRecipe.java
@@ -1,5 +1,16 @@
 package net.minecraft.server;
 
+// CraftBukkit start
+import java.util.ArrayList;
+import java.util.List;
+import org.bukkit.craftbukkit.inventory.CraftFurnaceRecipe;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.craftbukkit.inventory.CraftRecipe;
+import org.bukkit.craftbukkit.util.CraftMagicNumbers;
+import org.bukkit.craftbukkit.util.CraftNamespacedKey;
+import org.bukkit.inventory.Recipe;
+// CraftBukkit end
+
 public class FurnaceRecipe extends RecipeCooking {
 
     public FurnaceRecipe(MinecraftKey minecraftkey, String s, RecipeItemStack recipeitemstack, ItemStack itemstack, float f, int i) {
@@ -10,4 +21,14 @@
     public RecipeSerializer<?> getRecipeSerializer() {
         return RecipeSerializer.p;
     }
+
+    @Override
+    public Recipe toBukkitRecipe() {
+        CraftItemStack result = CraftItemStack.asCraftMirror(this.result);
+
+        CraftFurnaceRecipe recipe = new CraftFurnaceRecipe(CraftNamespacedKey.fromMinecraft(this.key), result, CraftRecipe.toBukkit(this.ingredient), this.experience, this.cookingTime);
+        recipe.setGroup(this.group);
+
+        return recipe;
+    }
 }