I recently upgraded my test box to 12.2 and encountered what appeared to be some start-up (boot) issues.
I went looking to refresh my recollection on some tools I was introduced to when 12.1 came along.
If you think you have systemd problems, try loading (YAST)
systemd
systemd-gtk (provides systemadm cli command)
systemd-presetspbranding-openSUSE
systemd-sysvinit
also, on cli, try systemd-analyze -h for a listing of additional diagnostics available
systemd-analyze -h
systemd-analyze time
systemd-analyze blame
systemd-analyze plot
Process systemd profiling information
-h --help Show this help
Happy debugging