Yes. I remember it happening on Chrome, so it likely was already a problem 2 years ago because since then I have been using Discourse with Firefox and it doesn’t happen there.
I think it does not happen when the address bar is hidden, like it happens when you scroll down in a topic, but it’s almost impossible to get that in chat.
As a workaround for getting the chat title on longer chats: using the sidebar to scroll is a little easier. There you can scroll the sidebar as far as possible and then scrolling again scrolls the whole window