I can’t say for sure that it is the exact same cause, but I had about one month ago the same behaviour on 3 computers, all running EOS with KDE and Wayland.
The solution for me was to replace sddm (the KDE display manager) by the git version : sddm-git from the AUR (in fact there is at the moment an even newer version in chaotic-aur, if you use it).
Just run : yay -S sddm-git
Next time you shutdown you’ll still have the long time waiting, but it should be gone after the next reboot.
See here the original post: Shutdown hangs at stop job for Simple Desktop Display Manager - #3 by BS86
All the best of luck.
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