I already posted a video here where you can see the flickering on win10 1809 in comparison with win10 21h1 (I don’t remember exactly)
So, lat week I experimented on my safe w10 1809, found the datasheet of the installed panel, and using CRU I increased the monitor refresh rate from the factory 60 Hz to 72 Hz (keeping in mind pixelclock limit searched in datasheet) with autosettings for other synchronization parameters. Then I felt that I couldn’t use the screen, or rather, I could, but after it I felt pain in my temples. This went on for 4 days and yesterday when I looked at the taskbar I saw the same "fast chaotic pixel movement". I set monitor back to 60Hz, but it didn't help. I set nvidia's output to fullrange, but that didn't help. ColorControl also demonstrated no-dithering.
Only a complete reset of EDID settings via CRU helped. After that, I saw that the taskbar has a “lazy slow standard flicker” and after another 1 day I get back my safe PC.
Any ideas?