System Information
Operating system: Linux-5.4.0-54-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GT 630/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 390.138

Blender Version
Broken: version: 2.92.0 Alpha, branch: geometry-nodes, commit date: 2020-11-24 13:30, hash: rB49f1c8ebecae
Worked: (newest version of Blender that worked as expected)

Short description of error
No material and no smooth shading after usage of geometry nodes

Exact steps for others to reproduce the error
Open the file. It contains a cube with a texture and smooth shading. The cube got manipulated by geometry nodes.
After usage of the geometry nodes, the colors and the smooth shading are gone.