Issue Summary

In Confluence 10.2.10 and 10.2.11, deleting a single instance of a recurring Team Calendar event causes the UI to hang/spin indefinitely. While the backend API successfully processes the deletion, the UI fails to refresh automatically. This is a regression as the behavior is not present in Confluence 9.2.x.

Steps to Reproduce

1. Install Confluence 10.2.10 or 10.2.11 with Team Calendars enabled.
2. Create a new Calendar.
3. Create a recurring event (e.g., daily or weekly).
4. Click on a single instance of that recurring event and select Delete.
5. Choose the option to delete only this instance.

Expected Results

The UI should close the dialog and remove the event instance immediately upon successful API response.

Actual Results

The UI shows a loading spinner indefinitely. The event remains visible until the page is manually refreshed.

Workaround

Manually refreshimg the page after deleting the event, the instance will not reappear. No data integrity impact.