Google calendar recurring event deletion with single events doesn't return all events

When the list_events method is invoked with the single_events parameter set to true and a recurring event in Google calendar is deleted, only six months worth of events with the status 'cancelled' is returned leaving additional events that should be deleted in my database.

When adding the option show_deleted combined with single_events set to true and with a sync token set, all events ever deleted are returned which is a huge list if anyone has gone through the process of creating and deleting a few recurring events. Shouldn't only the events deleted since the last sync token be returned?

Is this the intended behavior?