Impossible to systemctl mask non-existing service

Puppet Version: 6.15.0
Puppet Server Version: 6.15.0
OS Name/Version: CentOS 8

puppet apply the following snippet

service{'non-existing.service':

   ensure => mask,

}

results in. 

Error: Could not disable non-existing.service: 

Error: /Stage[main]/Main/Service[non-existing.service]/enable: change from 'false' to 'mask' failed: Could not disable foobar.service:

 
Desired Behavior:
A service can be masked irrespective of if the unit exists.

systemctl mask non-existing.service

Unit non-existing.service does not exist, proceeding anyway.

Created symlink /etc/systemd/system/non-existing.service → /dev/null.

and this is desirable since you want to mask things to stop a vendor setting
winning later.

puppet should proceed with the above mask for a non-existant service.
 
Actual Behavior:

The non-existant unit is not masked.