Whenever someone replies to one of my (witty, always genius) comments their comment stays “unread” in the notifications/inbix tab, with a red dot on the bell in the bottom left of the main UI.
I think they only get marked as read if someone else replies to them or if I go into lemmy in my browser to Mark As Read.
Personally I would like at least the red dot to go away when I press it. Messages can remain unread until I take action.