PHP-FPM option not available for restored servers


Strange issue today while I’m trying to migrate a VPS from Ubuntu 16.04 to 20.04. Virtualmin is working fine, PHP-FPM is available as an option while I create a new server. But as soon as I restore the backups from 16.04 the PHP-FPM option is not even showing and I can’t enable it for the restored servers.

Any clue?