As per the video below, it can be shown that the car geometry ignores the sea chest like a player would but when the vehicle enters the sea chest it gets pushed up and above the sea chest as if it had a geometry.
The expected behaviour is the vehicle would go through the sea chests like in earlier versions of DayZ.
This can be reproduced in offline and multiplayer environments
Mods used (not needed): Community-Framework, Community Online Tools
DayZ Version: 1.05.152553