For wayland, you should switch to sddm-git (yay -S sddm-git) which will remove sddm and install the sddm-git package. (I also did that some weeks ago, no negative consequences so far)
There are essential commits in the git version that are not yet in the release version, and it does not look like we will see an update any time soon
Recent “discussion” can be found here: SDDM takes time to close when rebooting/shutting down - #2 by BS86