Google Calendar Sync works erratically when I clone events

Google Calendar Sync works erratically when I clone events

Heres what I'm trying to do: 
Clone an event on zoho calendar. My gcalendar is setup to sync 2 ways. 

This works as expected:
When I clone an event from my zoho calendar and create a new event for a later time, the event shows in both the google calendar and the zoho calendar. 

But, 
On some occasions, the google calendar event does not list participants on the meeting. It is tough to figure out why this happens but it occurs consistently when we duplicate certain events and doesnt occur when we duplicate other events. 

How do I even start debugging this issue? Anybody else experiencing similar issues?


-Dinesh