How can I fix Leather Horse Armor and Potions in my Resourcepack?

Leather Horse Armor is now white on 1.21.4 and I'm still figuring out how everything works and Potions are just broken
{   "model": {     "type": "minecraft:range_dispatch",     "property": "minecraft:custom_model_data",     "index": 0,     "fallback": {       "type": "minecraft:model",       "model": "minecraft:item/leather_horse_armor"     },     "entries": [       {         "model": {           "type": "minecraft:model",           "model": "minecraft:custom/vehicle/fahrrad"         },         "threshold": 1       }     ]   } }
 {   "model": {     "type": "minecraft:range_dispatch",     "property": "minecraft:custom_model_data",     "index": 0,     "fallback": {       "type": "minecraft:model",       "model": "minecraft:item/potion"     },     "entries": [       {         "model": {           "type": "minecraft:model",           "model": "minecraft:item/potion/spezi"         },         "threshold": 1       },       {         "model": {           "type": "minecraft:model",           "model": "minecraft:item/potion/saft"         },         "threshold": 2       }     ]   }