**System Information**
Operating system: windows 10 1903
Graphics card: 1080ti * 2
**Blender Version**
Broken: 2.82.7 stable versioin
**Short description of error**
This issue appears both on eevee and cycles.
While using smooth shading, simply add a bump map and the shading lookes flattened.
{F8383487}
This issue appears more obviously when the number of polys is low.
**Exact steps for others to reproduce the error**
Bevel the cube with several segments and simply plug a bump map to the normal port of the shader node.
{F8383496}