Including AT (@) sign in issue summary creates bad links in Roadmap

If you put an @ sign into the summary, say "Tell marc@anyware he has found a bug", when this issue is shown in the roadmap, the link for the issue summary is broken/bad and includes a mailto: link to "marc@anyware" because some renderer is causing nested <a> tags in the output html.

This does not happen in other views such as issue navigator or "assigned to me" portlet.