It's normal behaviour.
Dot appear only after some amount of time and/or if there many unread
notifications.
If you wish immediate notification you may install Notifications Alert
extension - https://extensions.gnome.org/extension/258/notifications-
alert-on-user-menu/
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** Tags removed: xenial
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https://bugs.launchpad.net/bugs/1559491
Title:
Unread notifications dot mostly never appears, even when it should
To manage
Maybe it's theme-related and improved in 18.10 with the introduction of
Yaru?
** Changed in: gnome-shell (Ubuntu)
Importance: Undecided => Medium
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