If you are in LOS and range of an armed enemy, moving such a way is extremely dangerous.
If the bypass is across Open Ground you get -5 DRM (FFNAM/FFMO + overstack penalties).
Note, too, that your stack will be paying 4 MF (+3 overstacing MF penality) to bypass along two hexsides, which gives as much DFF opportunities to a given enemy unit firing at it.
All brokies and pinned guys will finish their MPh in the building, adding overstacking penalties to the guys who were previously inside it.
Your example is the demonstration of the "do not stack" tactical rule's validity, that players learn the hard way...