This happened on Tumbleweed which ships systemd v242.

For the complete debug logs, please consult https://bugzilla.suse.com/show_bug.cgi?id=1137373.

Except from the logs:

[ 25.202778] fyrfos systemd[1]: Switching root.
[ 36.627399] fyrfos systemd[1]: Starting udev Coldplug all Devices...
[ 36.714237] fyrfos systemd[1]: Started udev Coldplug all Devices.
[ 48.182070] fyrfos systemd[1]: Reloading.
[ 48.433421] fyrfos systemd[1]: Invoking unit coldplug() handlers…
[ 48.457773] fyrfos systemd[1]: dev-sdb5.device: Changed dead -> plugged
[ 48.466512] fyrfos systemd[1]: Invoking unit catchup() handlers…
[ 48.471053] fyrfos systemd[1]: dev-sdb5.device: Changed plugged -> dead
[ 48.741803] fyrfos systemd[1]: dev-sdb5.device: Changed dead -> plugged
[ 49.005134] fyrfos systemd[1]: local.mount: local.mount lost dependency BindsTo=dev-sdb5.device

This was already reported in #11997 but the fix was incorrect, see #12013 (comment)