This is probably the same bug as bug 1636939 and is happening because some groups are None (which means we return early in https://searchfox.org/mozilla-central/rev/eef39502e08bcd3c40573c65a6827828dce4a032/testing/mozbase/mozlog/mozlog/formatters/errorsummary.py#41).
Bug 1646761 Comment 1 Edit History
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This is probably the same bug as bug 1636939 (at least, the WPT part of bug 1636939) and is happening because some groups are None (which means we return early in https://searchfox.org/mozilla-central/rev/eef39502e08bcd3c40573c65a6827828dce4a032/testing/mozbase/mozlog/mozlog/formatters/errorsummary.py#41).