Various tasks in Plesk are never executed, they are stuck as new at Tools & Settings > Task Manager page.
The following error can be found in
ERROR 2022/09/04 Cannot fetch process properties: Cannot fetch 'run-plesk-task-93137.service' unit properties: dbus: connection closed by user
Connect to the server via SSH.
# systemctl restart dbus.socket plesk-task-manager
Warning: at Debian 10 or Ubuntu 18.04 there might be
polkit service, which also should be up & running. Restart it with
systemctl restart polkit in case the issue persists on these OSes.