Kirill nkv3d

It's not look like a Hydra problem, because I made the same test with Unreal Engine. For instance I export skinned character from UE to usd, and back, and normals was rebuilded.
On the other side Bake Skinning LOP is not a good choice,
because it bake into transforms matrix and point positions, which interpolated linearly in usd, and you can get squash & stretch effect between animation keys, and bad motionblur as a result.