When dropping email items into calendar (or tasks) tab, the created item has a title equal the akonadi URL of the email, but the link should be an attachement

Reproducible: Always

Steps to Reproduce:
1. (within kontact) drag&drop email into calendar tab
2. new calendar entry is created and popup window opens
3. title of the calendar entry is an akonadi link,  no other information inside window filled out

Actual Results:  
title is an akonadi link
akonadi:?item=69866&type=message/rfc822&parent=52

Expected Results:  
new calendar entry with akonadi URL as attachement.
can create it manually - though the link won't work, but that's another issue (bug filed against akonadi see https://bugs.kde.org/show_bug.cgi?id=338488)

Kontact 5.1
KDE Frameworks 5.17.0
Qt 5.5.1 (built against 5.5.1)
The xcb windowing system
on arch linux