I have set up Plasma so that the bottom right corner of my desktop triggers the "Show all windows - Current desktop" action. On Wayland, this action is harder to trigger than on X11 ; it takes a longer time, and sometimes I have to really insist on my mouse pointer to trigger it. I also noticed that setting a shorter trigger delay (like 50 ms or even zero) does not help. Plasma 5.13.1, Archlinux, Intel modesetting driver, Frameworks 5.47.
*** This bug has been marked as a duplicate of bug 374867 ***