I generally leave chat logged in during the day (which I can't imagine is any sort of corner case) and, if I pop off that tab for even just five minutes, I can easily accrue three or four notifications as people reply to some interesting thing that I said (hey, it happens occasionally…).
The problem is that when I click on the notification bubble and reply to that first message, the notification bubble then goes away and there is no way to get it back. Even from the StackExchange dropdown notifications box, there is no way to find those notifications.
Instead I have to scan the transcript manually, or instead do so using the teeth-pulling process known as Using SO Chat Search.
Please could you keep the notifications up even when I've spoken?
I do understand that another case is when you receive notifications whilst actively talking and you wouldn't want them accruing in that case.
Please do not cancel chat notifications, when I've only spoken in reply to one of those notifications!