Deleted occurrences show on calendar as cancelled

1. Add an event
2. Publish it
3. In the edit form, change the event date (i.e. deselect the original date and select a new date).
4. Save the event
5. View the event on the calendar

Result

Both dates are displayed. The new date is displayed as normal, and the original date is marked as cancelled.

Expected result

Only the new date is displayed, as normal. The original date is not displayed at all.

Note

In the event form, there is only 1 occurrence shown so it appears to have been deleted entirely. However, if you look at the manage_event or retrieve_event requests in the inspector you can see that the datestatuses object has all of the occurrences, including the removed one. The removed occurrence has status: 'C' (for cancelled).

Reproduce the event-date change described in the issue, then inspect the manage_event and retrieve_event requests, especially the datestatuses object and its cancelled occurrence. Trace where cancelled dates are rendered on the calendar and verify that the removed date no longer appears while the new date remains normal.