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Based on the content in https://src.osci.redhat.com/modules/mercurial/raw/4.8-rhel-8.2.0/f/mercurial.yaml, the module stream mercurial:4.8 does not define 'name' and 'stream' properly in the module.md file. Reason for doing it was explained in
http://post-office.corp.redhat.com/archives/rhel-devel/2019-March/msg00612.html

Further documentation in RHEL-8 Developer Guide:
https://docs.google.com/document/d/1IFFvXKvNZpLWAMS9-870bahMMtsWru8QOCIREmkd_58/edit#heading=h.lln13r876joj

Building a module in MBS from production branches (those with rhel-x.y.q suffix) might result in a module mercurial:4.8-rhel-x.y.q instead of mercurial:4.8, which is sometimes not that obvious. It is more than recommended to fix the module.md file right away and avoid problems in the future.

Check the tracker https://bugzilla.redhat.com/show_bug.cgi?id=1780081 for more info.