Offset center of mass on single Body?

Hi !

I’m still working on cars, and I’m trying to properly set my Center of mass, to prevent over/under steering and improve handling, and I noticed something: In my skeletal mesh, if I try to offset my center of mass while having only one Collision body, it does not work. However, if I add a second body, it seems to be working. Is it an expected behavior or a bug ?

Thanks !