When i test it at 1s with f/22. I can see the aperture close (befor or at least in the same moment as the rear doors are opening/which happens quite fast) and after 1s the shutter closes.

One thing i might add in the vid i used f/2,8 so the aperture was not visible .. if i would use f/22 and pre-release mode the rear door would open and the aperture would close ( to 22 ) and it would stay like that until i press the "normal" release button.