Over the last few hours, the SE chat rooms appear to have reverted to the SE favicon (). For example, the Root Access chat room, which is linked to Super User previously had SU's icon (http://cdn.sstatic.net/superuser/img/favicon.ico http://cdn.sstatic.net/superuser/img/favicon.ico). This seems to have affected all Chat.SE rooms.
Is this a planned change? Or is this a bug introduced in a recent update? If so, could it be fixed?
Comparing the source, the line
<link rel="shortcut icon" href="http://cdn.sstatic.net/superuser/img/favicon.ico?v=abcdef"> was missing previously. I'm not sure why. Looks like most browsers just grabbed the domain favicon (http://chat.stackexchange.com/favicon.ico) instead.
One other person could reproduce, while several others could not. It worked through a proxy, but not on two different computers, or a phone on a different internet connection. Some browsers (IE7, IE10, Opera) did not display a favicon at all.