The recurring events are not rendered as expected in some scenarios depending on the start time set.
The first event is not rendered for every week, but it is rendered for every second week.
When the recurring rule is 'FREQ=WEEKLY' the event should be displayed every week, despite of its starting time.
In 2020 R1 SP2 (2020.1.406) there is a bug related to missing events fixed with 2020.2.513. - Dojo with 2020.1.406
Starting with 2020 R2 (2020.2.513) the current behavior is introduced.
The issue might be related also to: #5978