Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1650/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.09
Broken: version: 2.91.0, branch: master, commit date: 2020-11-25 08:34, hash: rB0f45cab862b8
Worked: (newest version of Blender that worked as expected)
Short description of error
There's one light object in the scene and when rendering, it caused a pixelated fog. So I tweaked the tile size to 2 px and though it fixed those pixels, now I get weird flashing in random places. Video.
Exact steps for others to reproduce the error
Set Tile Size in Volumetrics to 2 px, anything other than 16 px will cause the flickering.
[Based on the default startup or an attached .blend file (as simple as possible)]