3D Character Creator Items and Capes don’t show when resource packs and behaviour packs change animations of the player.
i dont know how long this bug has been out for, but it sure has for a very long time. so basically, when you put on a resource pack or behaviour pack that changes the animations for the player, it makes 3D Character Creator items and Capes invisible. thats really all i gotta say but i hope this gets patched very soon