Even though it shows the WDL files in the list of qs-sca-scanned-code-files actually it fails to scan the WSDL files. This is failing on a server set up fusing a Jenkins pipeline. Every other extensions are working properly including XML using the same pipeline. We tested it on a separate desktop machine where it scans and reports the findings properly.
When we renamed one of the WSDL files as XML it worked.