Horse models are using version 1 instead of version 2 in resource pack

Summary: Horse model and texture is using version 1 while it should use version 2. It used to work after adding "min_engine_version": [1, 2, 6] in the manifest.json file but does not anymore.

Repro Steps:

1. Download VanillaBDcraft from the marketplace
2. Activate it
3. Play in a world and check horses in game : They are all using version 1 3D model and textures
4. Check the manifest.json which has the "min_engine_version": [1, 2, 6]

Observed Results:

1. All horses are using version 1 3D model and textures.

Expected Results:

1. All horses should use version 2 3D model and textures

Only horses are affected but maybe some other models I've not tested might be, such as the new villagers.