BibXML generation issue with IANA 6TiSCH references

[kesara]

Describe the issue

6TiSCH references shows the info page but failed to generate BibXML with an error.
Error example:

{"error": {"message": "Error resolving bibliographic item. Tried methods: auto (IanaAdapter: using docid IANA IANA /6tisch -> using query @.type == \"IANA\" && @.primary == true && @.id == \"IANA /6tisch\" -> no refs found): not found (Item not found), fallback (): not indexed"}}

Info	BibXML
https://bib.ietf.org/get-one/by-docid/?docid=IANA+_6tisch&doctype=IANA	https://bib.ietf.org/public/rfc/bibxml8/reference.IANA._6tisch.xml
https://bib.ietf.org/get-one/by-docid/?docid=IANA+_6tisch%2F_6tisch-cojp-parameters&doctype=IANA	https://bib.ietf.org/public/rfc/bibxml8/reference.IANA._6tisch__6tisch-cojp-parameters.xml

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