Can't change execution mode from php-fpm to fcgid (virtualmin-nginx 2.3)

Please take a look to this: and this:

In my case, if I switch from FPM to FCGId I got:

Changing PHP execution mode to FCGId (run as virtual server owner) ..
Failed to save website options : No PHP command found!

I temporarily solved downgrading virtualmin-nginx from 2.3 to 2.2:

apt-get install webmin-virtualmin-nginx=2.2