potions in resourcepacks reverting to white colour [1.21.4]

hey, im adding a custom potion using a fancy blockbench model to my game, and everything works, however all the potions have a weird white colour and do not resemble the original potion
I've got a resourcepack, and in minecraft/items/potion.json I have the following:
{
  "model": {
    "type": "select",
    "property": "custom_model_data",
    "fallback": {
      "type": "model",
      "model": "item/potion"
    },
    "cases": [
      {
        "when": "radiation_vial",
        "model": {
          "type": "model",
          "model": "draipcw:item/radiation_vial"
        }
      }
    ]
  }
}
my "case" works perfectly fine, and I see my custom potion in game, however all the other potions are just pure white (as if the overlay doesn't work?), and I have no idea what to do, is there a way to revert it back so that the potions have their colours?