See https://meta.wikimedia.org/w/index.php?oldid=7485728
Since $wgLocalInterwiki = 'm' on metawiki, [[m:Test]] is correctly interpreted as a link to [[Test]].
However, for some reason, [[m:w:Test]] is not parsed as a link at all, despite being a perfectly valid alternative to [[w:Test]].
Version: 1.23.0
Severity: normal