It was a Blender case, never noticed because Blender’s default for viewport “Studio Shading” mode which everyone uses by default is showing the perfect surfaces and none of shading.
Found an easy fix which solves entire problem with one click in this good video:
He selects in viewport shading MatCap, which reveals shading issues very well, better then any your texture you have(especially if you select horizontal or vertical dynamic strips).
The thing that fixes it all is called Weighted Normals.
