Bug in Browse Members Feature

I have noticed a bug in the management browse members pages.

The default view is sorted by email address I think:

http://groups-beta.google.com/group/GMusers/manage_members

and when you page to the next page (next 30 members) the URL is thus:

http://groups-beta.google.com/group/GMusers/manage_members?view=all&start=30

If you sort the memberlist by join date, the URL looks like this:

http://groups-beta.google.com/group/GMusers/manage_members?view=all&sort=joined

But if you page to the next thirty members by join date, the sort
reverts to sorted by email address. :(

The URL should look like these when paging through "sorted by join
date."

http://groups-beta.google.com/group/GMusers/manage_members?view=all&sort=joined&start=30

and

http://groups-beta.google.com/group/GMusers/manage_members?view=all&sort=joined&start=60
and et cet.