Dear Support Team,
Please try the following scenario. Create a weekly recurring event for the 4rth of April that has no end.
Go at the next week (9/4 - 13/4) and move the event (11/4) 1 hour forward. At the confirmation popup please select 'Edit the series'.
Go back to the previous week (2/4 - 6/4). The event of 4/4 has disappeared!!
The specific dates are used as an example. Feel free to use any date your want.
Thank you in advance,