Recipe remainders of items get deleted after smelting said item

Related to MC-269703. (Note: that one is about the fuel, not the input)

Steps to reproduce

1. Add the following recipe to a world. It smelts a Milk Bucket, which has a recipe remainder of a Bucket, into Cobblestone.

{
  "type": "minecraft:smelting",
  "ingredient": "minecraft:milk_bucket",
  "result": {
    "id": "minecraft:cobblestone"
  },
  "cookingtime": 100
}

1. Place a Furnace.

2. Place a Milk Bucket and some fuel in the Furnace and wait for it to smelt.

3. ❌ Notice how it doesn't leave a Bucket in its item input slot, nor does it drop an item stack, unlike for example the Crafting Table and Crafter.