SUMMARY

I have added a Google Calendar.  Events in Google Calendar are imported into Korganizer, but events in Korganizer are not being exported to Google Calendar.  I am convinced this used to work, but it seems to have stopped at some while ago (not sure when).  

STEPS TO REPRODUCE
1. Create Event in Korganizer
2. Create Event in Google Calendar
3. Sync with Google Calendar by selecting Configure Korganizer -> General -> Calendars -> Google Groupware -> Restart

OBSERVED RESULT

Google Calendar event appears in Korganizer, BUT Korganizer Event does not appear in Google Calendar 

EXPECTED RESULT

Google Calendar event appears in Korganizer, AND Korganizer Event appears in Google Calendar 

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: KDE Neon 5.27
(available in About this System)
KDE Plasma Version: 5.27.3
KDE Frameworks Version:  5.104.0
Qt Version: 5.15.8

ADDITIONAL INFORMATION

This used to work some months ago, but seems to have stopped at some point (not sure when).  
Akonadiconsole shows the message, 

' kf.i18n: KLocalizedString: Using an empty domain, fix the code. msgid: "%1, %2" msgid_plural: "" msgctxt: "Two statuses, for example \"Online, Running (66%)\" or \"Offline, Broken\"" '.  

I have no idea whether this is relevant.  

Any further troubleshooting ideas gratefully received.  

Thanks and regards