Team Calendar: Changing a single instance of a repeating event deletes all others in the series

Issue Summary

Changing a single instance of a repeating event deletes all others in the series in Team Calendars.

Steps to Reproduce

1. Create a repeat event (I.E. monthly first Tuesday; Daily; Weekly; Monthly).
2. Move one of the events to next week or other edits like changing its title, and selecting the "Edit this instance only" checkbox to not change it for all the other events associated with this recurrence.
3. Edit the same event (I.E. the title again or assign a "who" to the event) and save and ensure to check the same "Edit this instance only" checkbox.

Expected Results

Only the updated event should be modified, keeping the rest of the events with the older values.

Actual Results

The recurrent events are deleted.

Workaround

• For scenarios where the user is editing the event to move it to another date, assign the who field and then move the event.
• For scenarios where the title is being updated, once the events are gone, use the only event that is kept and re-select the recurrency with the Repeat event option, which will re-create the events.