Use setAmount for Recipe Amount

Spigot-API-Patches/Add-ItemStack-Recipe-API-helper-methods.patch

@@ -34,7 +34,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    // Paper start
 +    @NotNull
 +    public ShapelessRecipe addIngredient(@NotNull ItemStack item) {
-+        return addIngredient(1, item);
++        return addIngredient(item.getAmount(), item);
 +    }
 +
 +    @NotNull