System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 780/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.41

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
When the file loads, the viewport of the shader editor has a graphical glitch that changes every time the viewport refreshes (scrolling, panning view, edit settings, etc...)

Exact steps for others to reproduce the error
open the file.
look at the shader editor