alias parameter in nagios_host type clashes with metaparameter alias

It appears to be the same issue as the one reported in https://projects.puppetlabs.com/issues/3507. Nagios hosts have an alias parameter, and they can be repeated multiple times.
When creating several nagios_host resources though, one gets the error "can not create alias xxxxx object already exists". It seems as though that refers to the metaparameter alias.