Resource packs can't properly detect the banner pattern component.

When I try to swap the model of a shield based on what type of banner pattern it has, it simply does nothing.

To reproduce:
Open minecraft, apply the resource pack I have attached here, make a white banner with a red border, put it on a shield.

Expected result:
The shield should be white with a red border

actual result:
the shield is just white

Here is the item file that is telling the game to render a composite of three models, red border, white base and shield. (all the other base colors included should be irrelevant, so while they are present in the pack, I removed them from this)

{
  "model": {
    "type": "minecraft:condition",
    "on_false": {
      "type": "minecraft:select",
      "property": "minecraft:component",
      "component": "minecraft:base_color",
      "cases": [
        {
          "when": [
            "white"
          ],
          "model": {
            "type": "minecraft:select",
            "property": "minecraft:component",
            "component": "minecraft:banner_patterns",
            "cases": [
              {
                "when": [
                  {
                    "color": "red",
                    "pattern": "minecraft:border"
                  }
                ],
                "model": {
                  "type": "minecraft:composite",
                  "models": [
                    {
                      "type": "minecraft:model",
                      "model": "minecraft:item/shields/shield"
                    },
                    {
                      "type": "minecraft:model",
                      "model": "minecraft:item/shields/white/base"
                    },
                    {
                      "type": "minecraft:model",
                      "model": "minecraft:item/shields/red/border"
                    }
                  ]
                }
              }
            ],
            "fallback": {
              "type": "minecraft:composite",
              "models": [
                {
                  "type": "minecraft:model",
                  "model": "minecraft:item/shields/shield"
                },
                {
                  "type": "minecraft:model",
                  "model": "minecraft:item/shields/white/base"
                }
              ]
            }
          }
        }
      ],
      "fallback": {
        "type": "minecraft:model",
        "model": "minecraft:item/shields/shield"
      }
    },
    "on_true": {
      "type": "minecraft:model",
      "model": "minecraft:item/shields/shield_blocking"
    },
    "property": "minecraft:using_item"
  }
}