Description
xml2rfc --v2v3 generate files ending with ".v2v3.xml" by default. Yes, there is an ability to specify an output filename (i.e., xml2rfc -o), but idnits3 should special-case this, since xml2rfc --v2v3 predates idnits3.
URL to example draft/RFC exhibiting the issue
https://pypi.org/project/xml2rfc
Please remove posting the URL to a file as being mandatory, as some issues aren't file-based