> Not sure this will help, but somewhat seems related?
No, that seems quite different. You sure you posted a correct link?

But anyway, I decided to abandon the Wayland idea. I did to things instead. Firstly, I posted a 
bug report to nVidia forums [1]. This seems to have gone unnoticed, but someone has posted a 
similar bug report for the latest line of drivers [2] (450.xx - I'm on 440.xx since 450 is not 
yet in backports) and it looks like nVidia is actually working on this. There is hope. Secondly, 
I made a decision to abandon Firefox and give Vivalid a try. Firefox has been going in a wrong 
direction for me for the past couple of years (essentially removing configuration options and 
adding features that are major annoyance and enabled by default) and the bugs that I mentioned 
earlier were the final nail to a coffin. After the first few days of using Vivaldi I am very 
happy with it. No more tearing problems like in Firefox and no more problems with suspending to 
RAM. Most importantly, customizability of Vivaldi is just stellar. Performance could be better 
but I guess you can't have everything. If I don't run into any critical bugs it looks like I'll 
be staying with this browser.

Janek

[1] https://forums.developer.nvidia.com/t/bug-rendering-broken-after-waking-from-suspend/147206
[2] 
https://forums.developer.nvidia.com/t/resuming-from-suspend-issue-driver-450-57-fedora-32-modesetting-enabled-gtx-750-ti/146265