Can't convert Models with 2 or more textures

[Potato-Man5]

Models with 2 or more textures such as piglin runts, clangers, spore medics and etc can't be converted

This is what appears when models try to get converted:
Parsing model JSON.
Warning: could not find model piglin_grunter_attack in any resource pack.
Failed to convert model.

Even though the attack texture of the piglin is there it fails to find it. Please fix as we need accurate renders of them in idle for the wiki