No calendar/reminder notifications showing on Ubuntu Touch

Calendar events show no notification which makes them really easy to miss. Only a heads-up notification is shown which also vanishes after a short time.

What I expected to happen:
-set a reminder via "Reminder" or "Calender" app
-an alarm goes off at the set time
-a notification will be visible in the notification area stating time, date and title of the calendar event

What happened instead:
-set a reminder via "Reminder" or "Calender" app
-an alarm goes off at the set time
-no notification is shown

DistroRelease: Ubuntu Touch r22
Device: BQ Aquaris e4.5
Package: indicator-datetime 13.10.0+15.04.20150318~rtm-0ubuntu1
Uname: Linux 3.4.67 armv7l
ApportVersion: 2.14.7-0ubuntu8
Architecture: armhf
Date: Fri Dec 12 08:59:10 2014
InstallationMedia: Ubuntu Utopic Unicorn (development branch) - armhf (20150508-031218)