Try the URL in the bug, see this error.
Before we had Topic:Rylnpvcpshj9n30s , links to topics and actions on topics were of the form Talk:<boardname>?workflow=<topic UUID>(&other params...). The Permalink action item generated these links, so there are numerous old posts and bugs with these URLs. They should redirect (301 Moved Permanently?) to the improved URL, ideally preserving other query string parameters and the fragment