Docker's PIDs limit (i.e. "docker run --pids-limit...") value lost after some systemd operation

Issue

• After executing some systemd operation, like enabling a service, the cgroup's PIDs limit (pids.max) value for all containers running on the Host is lost.

# CTR=`docker run --pids-limit 111 --detach --rm busybox /bin/sleep 8h`
# cat /sys/fs/cgroup/pids/system.slice/docker-${CTR}.scope/pids.max
111
# systemctl show docker-$CTR.scope | grep TasksMax
TasksMax=18446744073709551615
# systemctl disable --now postfix
# systemctl enable --now postfix
# cat /sys/fs/cgroup/pids/system.slice/docker-${CTR}.scope/pids.max
max