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MorphTArget shading problem with blendshapes from maya.

Hi, all. We’ve got problems with blendshapes and weird shading.

I know, that is a old problem, but nothign helps.
Elbow blends for example.

From maya
1/ unlock normals? -nope
2/ Average, Conform, set to face, soften edge - nope

Unreal 4.20 custom.
1/ Import normals - nope
2/ import normals and tangents - nope

Video
https://youtu.be/5dLB0y7oWdA

Thanks for help