Trac 0.11 allows customizing ticket workflows and we created a new 'resolved' state (pending QA verification), but now 'resolved' tickets show up as active in the milestone queries in the roadmap page.
It turns out that the Trac developers were aware of this too and added the [milestone-groups] trac.ini section to allow customizing the milestone queries, what's marked "active" or "closed", and more. Nice.