I noticed that main chat room of Project Management Stack Exchange is not shown in the active list. It is not shown even I select "people" or "event" tab. Not even when I select to see frozen/deleted rooms. It's only visible when I select "mine" tab. This is not created as a discussion room between two users but by feeds as a replacement of old chat room with the same name.
What makes an unfrozen chat room not appear in the active list? Does having a frozen with the same name stop the newly created room not appear in the active list?