Each site used to have its own chat room(s), even beta sites.
Now on https://security.stackexchange.com and https://softwarerecs.stackexchange.com when I open the upper left menu and click "chat", I am sent to:
https://chat.stackexchange.com
Is it a new policy, or a bug, or my fault?
See the URL in the lower left when I hover my mouse on "chat":
When I click on it, it sends me to a page where 27 pages of chatrooms appear, with entertaining names such as "Maid Café" or "The Frying Pan", and finding which ones are about information security is a big challenge.