If a page has a discussion page, which is then removed, ikiwiki seems not to notice that the discussion page has gone away, and does not update the link to it in the action bar.
Reprocued with 2.5 --Joey
Looks to me like loadindex is populating %destsources with information that the old discussion page exists, which isn't invalidated when ikiwiki discovers that the page is gone. This leaves dangling links whenever any page is deleted, not just a discussion page. --Ethan
Here's a patch that trawls through %destsources deleting pages when they are found to be deleted. It's a little inelegant, but it's simple and it works. --Ethan