(Still unfixed on salsa.debian.org as far as I can tell.)
On a bullseye system, systemd[1] now issues the following warning:
systemd[1]: /lib/systemd/system/openafs-client.service:22: Unit configured to use KillMode=none. This is unsafe, as it disables systemd's process lifecycle management for the service. Please update your service to use a safer KillMode=, such as 'mixed' or 'control-group'. Support for KillMode=none is deprecated and will eventually be removed.
I don't know what the timescale is for removing KillMode=none, but one may want
to start exploring alternatives. (Perhaps KillMode=mixed with SendSIGKILL=no ?
There may be better solutions, though.)