Hi, sorry for the late response… I’ve installed my relatively modern AMD Radeon RX 6500 XT video card, replacing the 2009 vintage Nvidia card. My KDE install is showing Wayland, not X11. And there are currently no issues in the display area (flickering, etc.). All is good. I’m satisfied that the issues were caused by the very old Nvidia card.
Similarly, Fedora KDE is working great on my 14 month old mini pc using onboard AMD graphics (AMD 680M). I’m successfully dual booting both of my desktops now. Thanks!