The default configuration in Governance Registry (G-Reg) has a WSDL handler that deploys all WSDL files into /_system/governance/trunk/wsdls/..... Pls check if your WSDL is deployed into this location.
To deploy the WSDL in the registry path defined in your artifact.xml you will need to disable the handler function. This can be done in repository/conf/registry.xml file of your G-Reg distribution. Comment out the WSDL handler section that commences with
Hope this helps!
Regards, Gillian