The door has an adjustment for how far it is pulled in. It obviously has to go past the second latch to be latched by the second latch. After the given time the vacuum is released letting the door back to the latch point. Wouldn't be smart to have the door held closed only by the vacuum linkage. The amount it releases is adjustable. But there always will be a certain amount that the door moves when released.
Bosch Master, ASE Master, L1
33 years MB technician