For example, this issue shows a reference:
~bttelle referenced this from <a href="/~bttelle/todo/1" title="~bttelle/todo#1: learn markdown">~bttelle/todo#1</a> but clicking on it leads to HTTP 404.
Heh, ticket references get html-linked even when in backticks. What idiot coded that? Oh wait it was me.
this is also a privacy issue as it leaks ticket titles.