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-gtk (provides systemadm cli command)

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