A small but slightly annoying bug has popped up on the site over the past week. No matter what I do, the last alert/notification in the bell menu refuses to mark as read. I kept rereading the same one, thinking maybe I was mis‑clicking, but it turns out it’s consistent: the final item in the...

I'm subscribed (without email) to a number of threads, and lately I'm noticing I'm not receiving many notifications of new activity in those threads (via bell icon above). Is this a known issue?