1.20.6: Custom Data Confusion

I am updating a server project datapack to 1.20.6 (our plugins aren't ready for 1.21) but I keep getting stuck with this in misode: Basically in my old code I had this for the custom stick with this nbt data to execute off of.
        {
          "type": "minecraft:item",
          "name": "minecraft:stick"
        }
      ],
      "functions": [
        {
          "function": "minecraft:set_nbt",
          "tag": "{death_sound:1b,backrax:1b}"
        }
      ]
    }
  ]
}

and I am trying to use misode to help update this but keep getting an error: