Nvidia 555.58 + 4k@120Hz Causes Flickering & Artifacting on X and Wayland With Arch

As an addition to the topic, I would like to add my post to see if it is also related to this whole problem:

https://forums.developer.nvidia.com/t/i-cant-reach-4k-240-hz-on-my-monitor-via-hdmi-2-1/335081