`comments_pagename` is `comment_` so the above code needs a comment page to contain
two underscores. I think that is the root of the bug. --[[Joey]]
+
+> Removed the trailing underscore in the regexp, so it should be fixed,
+> though I have not tested the fix. Leaving this bug open until it's
+> confirmed fixed. (I deployed it to branchable.)
+>
+> This will only fix the stored permalink metadata for a comment when its get
+> preprocessed again, not immediately. That's ok for notifyemail,
+> but other uses of permalink might need a wiki rebuild to get the bug fix.
+> --[[Joey]]