When deleting or canceling a calendar invite that has several invitee/s, the updated notification sent does not communicate “canceled” event just that the event has been updated. Using gmail as primary calendar.
It is possible that the event is changed directly in the Google calendar - can you confirm that?
Yes, I can confirm that the event did not change in my Google calendar.
OK, in that case please enable GData logging in the menu Tools - Settings - Advanced and simulate the issue. Then send us the logs so we can analyze them. Thank you.