Customer Frontend: my bookings show past events even if "hide past events" is selected

Your menu item is not an event menu it is a listing of events you can book for. For many sites the closing date is before the event start and the filter will hide these as well as events that actually started in the past - it is designed to show events that you can still book for.

The code here has not changed so it should work the same way it has all along.

If you are looking for events that exclude those that have started in the past then the most natural way of achieving this is using an event list menu item as opposed to a listing of available registrations

I'ts an idea but against any logic. Why did you change that in the new version (i hadn't this in the older version) ? Where is the logic? A past event is (in human logic) an event where the event date lies in the past and not the end of registration date. make sense, or not?

You could use a normal JEvents menu item e.g. a date range menu item and filter it in the options to show only events you can register for.

Oh.. i thougt that past events was calculated upon 'end date' of event and not end of 'registration date'.
It's easier for the manager to duplicate an event to create another one by only changing start and en date with a default end registration date instead to change also always the end of registration date. Do you have an easier solution for that? Thx

I logged in to your studio1 site and took a look at the first of these events "Power Plate 1215" and see that the registrations close on 31/12/2020 - so they are not in the past since people can still sign up for these events.