I don't use Twitter very often and only check the website every couple of days. When I open a new tab, type twitter.com and press "enter", the website loads.
When I have a notification, the red circle badge on top of the "Notifications" menu entry appears for a fraction of a second and then disappears. It takes 28 seconds after the page has been loaded for it to re-appear.
When I click the notifications menu entry they are immediately visible and do not disappear.
I suspect this is done deliberately by Twitter to prevent people from closing the twitter tab in their browser. (nudging, dark pattern)
