Hi there - apologies if this has been raised before!
It would be really helpful for users to receive a notification when someone @them on a thread to direct them back to it. I would have found this very helpful in reverse too (receiving notifications when someone has @ me).
Thinking a little red dot 🔴 or number somewhere on the site - not an email - god we all get too many of those! With an option for users to opt out if they don’t want?