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.
Video: https://www.youtube.com/watch?v=uKgC0NCOYHA
This can be reproduced in offline and multiplayer environments
Mods used (not needed): Community-Framework, Community Online Tools
DayZ Version: 1.05.152553