Bug? Backend/ Admin links in WP 3.0 domain mapping do not allow blog switching

OK, I’m working on setting up WP 3.0 (currently beta 2) w/ the domain mapping plugin. I’ve set up the domains + they seem to work OK. But the backend links all point to the mapped domain (e.g. Super Admin / Sites “Edit” or “Backend” etc.). What I have to do is visit the site first, then click on dashboard and voilá! (i.e., then it works 😉 )

This is a bug, no?

Or am I missing something? O_O