@av8r If you are not able to get autologin working with SDDM and Plasma Wayland, you might try removing the ‘User=****’ entry in kde_settings.conf, and instead configure autologin using YaST > System > Sysconfig Editor, and navigate to Desktop > Displaymanager, edit DISPLAYMANAGER_AUTOLOGIN setting the desired username, and ‘OK’ when done. Not sure if this will make a difference with the outcome. Either way works for me.
Here’s another thread where a user was experiencing similar issues, and it was suggested to try using a different displaymanager (but you must make sure you’ve configured autologin via YaST first of course). See how that goes.