**System Information**
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.77
**Blender Version**
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-01 07:02, hash: `rBc78c4252669a`
Worked: (newest version of Blender that worked as expected)
**Short description of error**
Shader Editor has psychedelic graphics background. It changes pattern as you zoom in/out.
**Exact steps for others to reproduce the error**
1. Start Blender.
2. Open "Shader Editor".
3. Observe the psychedelic graphics background.{F8829841}