SUMMARY
I am running KDE Neon 5.14.5 and Kontact 5.10.1. I have two GMail accounts configured in Kontact including their associated calendars configured. I wish to drag an email to the calendar to create a new event but this does not currently work.


STEPS TO REPRODUCE
1I want to create a new calendar event from an email, so I drag the mail from my inbox onto the Calendar icon on the left-hand side. According to this page (https://docs.kde.org/stable5/en/pim/kontact/side-pane-drag-and-drop.html) 


OBSERVED RESULT
The event subject looks as follows:

"akonadi:?item=45620&type=message/rfc822&parent=55"

I also do not get any of the email body transferred into the event body, making the feature pretty useless overall.


EXPECTED RESULT
I should get a new calendar event with the subject populated with the same subject from the email.


SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.15
KDE Plasma Version: 5.15.0
KDE Frameworks Version: 5.55.0
Qt Version: 5.12.0
Kernel Version: 4.18.0-15-generic
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-8550U CPU @ 1.80GHz
Memory: 7.5 GiB of RAM


ADDITIONAL INFORMATION
Another user reports this problem exists on Neon Dev Stable too. See this forum thread for more details:
https://forum.kde.org/viewtopic.php?f=215&t=156828&sid=248f8696ef3b37d0a5b54bd1836a0937&p=411109#p409937