[Bug] item_craft events return "AIR" in the %item% variable instead of "FILLED_MAP"

Example :

```
  prevent_map_dupe:
    type: item_craft
    conditions:
      - "%item% == FILLED_MAP"
    actions:
      default:
        - "cancel_event: true"
        - "close_inventory: true"
```

It doesn't work because %item% returns ``AIR`` instead of ``FILLED_MAP`` while trying to duplicate a map using an empty map and an existing map in the crafting table.