[Unsolved] iOS 8 Exchange Emails read on other devices do not clear out from Lock Screen

Creating this thread again since the last one got marked 'solved' automatically although no solution was found.

My Google Apps (Exchange) emails on the lock screen are not disappearing when I read them on other devices (eg. my iPad or Mac). On iOS 7 this used to work very consistently for me, that is, when I received an email on 3 devices and read it on one of them, the email would instantly be marked as read on the other devices and the notifications would be cleared out.

Furthermore, if I slide the notification of a read email on the lock screen and delete it, it has no effect on the server. So this is certainly a bug.

PS: Also tried Push email notifications with iCloud mail, same problem. For iCloud, even the icon badge count is not updated.