If one attempts with the new software to edit a redirected page (by fiddling with the URL) one is simply redirected to the destination. So it becomes impossible to resurrect a page once it has been redirected.
When you arrive at a redirected page, you'll notice that the subtitle is "Redirected from..." with a link; that link will take you to the original page. Clicking "edit" while there will edit the redirect page, not the destination. You'll notice that "redirect=no" has been added the URL--if you want to use the URL directly, you'll have to do that too.