Resizing folder part and un-resizing it: cuts events?

When I trim the start of a folder part which contains, let’s say, 3 different events on 3 underlaying tracks, Nuendo properly trims the underlaying events. But when I trim the start of that folder part back to its original position, it seems that Nuendo has cut the (portions of) the underlaying events?

Is this proper behaviour? Should it not be the same as trimming individual events?
Thanks, Niek/ Amsterdam.