Syst em Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce 920M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 419.17
Blender Version
Broken: version: 2.81 (sub 12), branch: master, commit date: 2019-10-02 14:56, hash: rB02ad256f9aaf
Worked: (optional)
Short description of error
I've opened blender files of previous my beta build and some polygons have become invisible. Not hidden. You can pick them. They exist. They are just invisible and dont react to any texture change.
Polygons also are invisible in "Solid" Viewport mode.
Exact steps for others to reproduce the error
open file using current fresh build that was saved with previous build 3-4 weeks old.

