Custom model data in advancement datapack

Im working on an advancement datapack, but ive been stuck trying to give icons a custom model data for hours. It all works fine, datapack is fine etc, but whatever i try to do just doesnt work { "display": { "icon": { "id": "minecraft:gold_ingot", "minecraft:custom_model_data": 1, "count": 1 }, "title": "Wagoo", "description": "The 'clart' of your journey", "background": "minecraft:textures/gui/advancements/backgrounds/adventure.png", "show_toast": true, "announce_to_chat": false },