Paper/nms-patches/CraftingManager.patch

--- a/net/minecraft/server/CraftingManager.java
+++ b/net/minecraft/server/CraftingManager.java
@@ -158,12 +158,14 @@
 
         do {
             if (!iterator.hasNext()) {
+                inventorycrafting.currentRecipe = null; // CraftBukkit - Clear recipe when no recipe is found
                 return ItemStack.a;
             }
 
             irecipe = (IRecipe) iterator.next();
         } while (!irecipe.a(inventorycrafting, world));
 
+        inventorycrafting.currentRecipe = irecipe; // CraftBukkit
         return irecipe.craftItem(inventorycrafting);
     }
 
@@ -175,12 +177,14 @@
 
         do {
             if (!iterator.hasNext()) {
+                inventorycrafting.currentRecipe = null; // CraftBukkit - Clear recipe when no recipe is found
                 return null;
             }
 
             irecipe = (IRecipe) iterator.next();
         } while (!irecipe.a(inventorycrafting, world));
 
+        inventorycrafting.currentRecipe = irecipe; // CraftBukkit
         return irecipe;
     }
 
@@ -210,7 +214,7 @@
     }
 
     public static int a(IRecipe irecipe) {
-        return CraftingManager.recipes.a((Object) irecipe);
+        return CraftingManager.recipes.a(irecipe); // CraftBukkit - decompile error
     }
 
     @Nullable