The biggest thing I can think of is that X11 is more flexible when it comes to specifying custom resolutions; which some people use to output 240p on CRT TVs for emulation. AFAIK, there is currently no real equivalent for xrandr on any Wayland compositor.
I’ve also noticed that Grsync’s password prompt is broken on Wayland. Thankfully, it has a feature that lets you preview the command it’s about to run, so that you can copy and paste it into a terminal.
Being a KDE user on EndeavourOS, I use Wayland everyday. I switched over a few years ago for Waydroid, but now X11 isn’t even an option for me with the current release of KDE.
… During alt tabbing
That seems odd that it wouldn’t happen on x11 on the same settings then. I’d place the blame on your window manager.
Mine at least has a setting for showing icons instead of the window contents, on both x11 and wayland. If I had a program without icon woth that setting I’d get a big icon no matter what.
… When I ran my system in Wayland, during alt tabbing, that’s when it would show me the w