"Unable to set ownership" error with logdest on agents running as root

As described in the attached issue, a puppet agent run raises the following error: "Puppet (err): Unable to set ownership to puppet:puppet for log file".
Caused by trying to change the owner to puppet:puppet which doesn't exist and shouldn't happen when run as root.

This happens if the file doesn't exist but also when it does, since it writes to a temporary file and tries to set owner on this one too.

Also the command line parameter "--no-manage_internal_file_permissions" dosen't help.

Although this should have been fixed, it's not.