If I recall correctly, some time ago, the blue number next to your avatar was always updated live, in both directions.
Now, this isn’t working (anymore). The number counts up when a notification is pushed, but doesn’t count down automatically in many cases.
For example, if I receive a desktop notification for a reply and click it, Chrome activates and I’m navigated to the post, but the blue 1 remains. Clicking on the avatar dismisses it.
The same happens when the notification is cleared by manually navigating to the post.