The json map doesn't have an entry for `default`, which creates a server error for https://www.mercurial-scm.org/repo/hg/?style=json. Other maps redirect default to shortlog, which would also work for json.
Fixed by https://mercurial-scm.org/repo/hg/rev/6772cf74ff6f Yuya Nishihara <yuya@tcha.org> hgweb: show shortlog by default in json output (issue5978) (please test the fix)
Bug was set to TESTING for 7 days, resolving