In T150345#2047147, @tomfcz wrote:

Good evening,
We have carried out many tests and it seems that the problem occurs when one vehicle is attached to another vehicle with the attachTo command.
When the base vehicle and the attached vehicle are spawn and driven by the same person, no problem but when it is different people who do this, the desynchronization concerns appear for the passages and do strangest things.
Hope this helps you, have a good evening and good luck!

The problem is observed not only with cars, but in general with objects that belong to CfgVehicles