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I've noticed that whenever I check new alerts, they all get marked as read after I open them up, but that's not the case for conversations. It would be nice for them to also have such a feature so I don't have to open up new tabs to mark them as read, or at least have a little button in the pop-up list to mark them all as read.
Read your conversations, and leave conversations you’re not interested in reading. The notification is sticky because they’re private messages for your eyes only.