When group managers attempt to navigate to a wiki page that is not published, a Page Not Found exception is thrown and they are redirected to the error page. An exception to this is the manager who created the page. For that person, it is accessible.
Both accounts with which I'm testing have the same group membership type ("Manager"). The difference was that the account which can see the page is the one that created it. However I manually updated CS_Wiki_Pages.UserId with the id number of the member who cannot see the page, and they still cannot load it. That seemed a little strange.
How can group manager edit unpublished wiki pages?