Issue Summary

Confluence sent incorrect notifications when deleting one of the moved events within a series of weekly repeating events.  

This is reproducible on Data Center: (yes)

Steps to Reproduce

1. Install Confluence with three users (admin, watcher X, and watcher Y).
2. Set up the Mail server on Confluence. 
3. Create a calendar with two watchers (watcher X, and watcher Y). 
4. Create a recurring event in the calendar, for example, each Monday from Sept 2nd to Oct 7th, 2024.
5. Move the single event from Sept 16th to Sept 17th.
6. Move the single event from Sept 23rd to Sept 24th.
7. Move the single event from Sept 30th to Sept 29th.
8. Delete the event on Sept 24th
9. Check the email notification.

Expected Results

Each of the two users should only receive one email notification that the Sept 24th event has been deleted. 

Actual Results

Six mail notifications were received that three events were deleted as below:

1. Sept 17th (incorrect )
2. Sept 24th (correct )
3. Sept 29th (incorrect )

Please refer to the test result for Confluence 9.0.3 as below:

test_result_Confluence_9_0_3.mov

Workaround

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