The Scheduler generates an additional event when a recurrenceRule with an end date and nth occurrence is used.
RRULE:WKST=MO;FREQ=MONTHLY;INTERVAL=1;BYDAY=TH;UNTIL=20201015T045959Z;BYSETPOS=4 should create an event, occurring every fourth Thursday until 15Oct2020. The scheduler will display an additional event on the 22Oct2020. Creating an event and manually configuring the recurrenceRule for an event, occurring every fourth Thursday until 15Oct2020 will result in the same behavior.
An event is displayed for 22Oct2020
No event should be displayed for 22Oct2020.