Issue Summary

Using CalDAV client and rescheduling individual recurrence event in and switching allday<->non allday shows duplicate events in CalDAV client

Steps to Reproduce

1. Create a recurrence series in Team Calendars
2. Subscribe to the calendar using CalDAV in Thunderbird
3. Edit one of the events individually and switch it between allday<->non allday

Expected Results

Both the original event and the rescheduled event will show in the CalDAV client

Actual Results

Only the rescheduled event should show.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available