Atlas compositing no longer working as of 1.21.90

When using “atlas compositing” to make up a single item texture in the item_texture.json in any of these ways and any other way i could think of.

{
  "resource_pack_name": "Tinkers Construct",
  "texture_name": "atlas.items",
  "texture_data": {
    "tax_r_gold_99ab41": {
      "textures": [
        "textures/ftb/tinkers/items/iparts/hand_axe/handle_tconstruct_hepatizon",
        {
          "path": "textures/ftb/tinkers/items/iparts/hand_axe/head_tconstruct_rose_gold"
        }
      ],
      "additive": true
    },
    "tax_slim_b917b5": {
      "textures": [
        "textures/ftb/tinkers/items/iparts/hand_axe/handle_tconstruct_hepatizon",
        "textures/ftb/tinkers/items/iparts/hand_axe/head_tconstruct_slimesteel"
      ]
    },
    "tax_wood_0b5e36": {
      "textures": [
        {
          "path": "textures/ftb/tinkers/items/iparts/hand_axe/handle_tconstruct_iron"
        },
        {
          "path": "textures/ftb/tinkers/items/iparts/hand_axe/head_tconstruct_wood"
        }
      ],
      "additive": true
    }
  }
}

It will display the correct textures in the hotbar, but in the players hand at least 1 component wil be missing