Incorrect pings in server list, net_slist_timeout broken

Sometimes when the refresh of the server list is interrupted after the packets are sent, high ping servers can be shown with a low ping. In the most extreme case, all servers are shown with zero ping. The easiest way to reproduce this is to set net_slist_timeout 0.2, ie below the pings of some higher ping servers.
What I expect to happen is no servers above 200 ping would appear in the list.
What actually happens is servers with pings above 200, are shown with incorrect pings that are lower than 200.

This affects all versions, and nexuiz 2.5 and current dp master.
It might explain why players often join my server, and then complain 'wtf ping', a problem I first noticed in nexuiz.

If this was fixed it might be useful for adding a max ping field to the list.