I was just trying to set my PHP version lower in my hiera/custom.yaml file and received this error on provision.
Error: Could not find dependent Service[php7.1-fpm] for File_line[mhsendmail php.ini] at /tmp/vagrant-puppet/modules-f7642ebb04f06d0f4736b1615980b144/mailhog/manifests/init.pp:60
I think we need to be less specific or pass in the hiera value to the php version in the dependency.