It may happen that apps crash or you have to reset your virtual machine. You will then notice that openSUSE cannot load KDE. You are logged into IceWM by default.
Even changing the display manager in Yast via /etc/sysconfig doesn’t help.
How do you fix this issue?
Simply reinstall the package plasma5-session with the command below.
sudo zypper in -f plasma5-session
Or you can simply reinstall KDE and KDE Plasma with the command below.
zypper install -t pattern kde kde_plasma
Reboot the vm and now you will log into KDE as before.