It was a Bot account. I much have blocked bots after it sent the message.
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I’ve seen that before.
(Honestly, the web app is a little janky. Not sure about other apps.)
The trick I used to get it to stop indicating a message for anyone who might want to know:
- On the “inbox page” (/inbox in your instance), switch from “Unread” to “All”.
- (Get ready because there’s a timing component to the next three steps.)
- Switch back from “All” to “Unread.”
- The “Mark All As Read” button should appear at least momentarily while the page is loading.
- As soon as you can, start rapidly spamming the “Mark All As Read” button and cross your fingers.
- If you’re lucky, that did the trick and it won’t display a “1” on your bell icon. If not, repeat from step one. It shouldn’t take much more than three or four tries to make it work.
I mark one of my read messages as unread, go to “all” messages, then hit “mark all as read”.
Might be a deleted / removed message, or reply to one, or a blocked user.