Geforce experience overlay bugging out only since most recent Nvidia drivers?

Grab some popcorn, head to the Nvidia forums and read some of the comments: https://www.nvidia.com/en-us/geforce/forums/game-ready-drivers/13/435761/geforce-46172-game-ready-driver-feedback-thread-re/

Any drivers after around 457.XX are completely broken and unless you need specific functionality that only more recent versions will give you (e.g. you own a 3060), roll back to a more stable release.

Micro-stutters in many games, latency, VR performance degradation, flickering in Chrome watching streams or resizing windows, flickering in games and other 3D apps, etc.

I am using 457.30 with my 2060 and it’s been very stable. Try rolling back and see if your flickering disappears.