Default leather color not working

I have made a resource pack that adds custom hats using a blockbench model replacing leather helmets.
summoned with:
give @a minecraft:leather_helmet[equippable={slot:head,damage_on_hurt:0b},item_model="custom:hat"]
Everything works once a dye is applied, but for some reason the default color isn't working. Any tinted model faces are invisible instead of using the default color.
{     "model": {       "type": "minecraft:model",       "model": "custom:item/hat",       "tints": [         {           "type": "minecraft:dye",           "default": 14874362         }       ]     }   }