I did change BorderlessMaximizedWindows to false and it gave me back the title bar .The flickering is still there on both X11 and wayland. If you want I can send you a video of the flickering I am talking about.
No, today I trust you
I have no idea about AMD GPU, what did your search about it reveal?
Try other kernel (amd) or LTS or just linux.
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Ye changing kernel didn’t effect the flickering.
I installed base arch with KDE and it has the same issue. So it looks like its an issue with KDE plasma`s window management on systems with 3 screens.