anonymous redirect breaks login

If I configure the anonymous user to redirect to a panel it doesn't have access to, user login stops working. The logs don't even show the login attempt, only that anonymous was denied access to a page. If I change it to "themed," users can log in without any problems, and the user role is redirected to the proper panel.

That is to say, even if anonymous user can't view a panel, the user should still be able to log in.