Since i switched to testing for plasma 6 yakuake has been refusing to stay on top when selecting another window. The settings option to stay on top and the little button for the same at the bottom right also does not work.
Tried with a new user? If that works, then
https://wiki.archlinux.org/title/KDE#Plasma_desktop_behaves_strangely
no i did not try, but i found out that it works again as of latest 1 or 2 updates on testing branch.