Set tangent at spline point not working!

Hi, yes i am updating the spline at runtime. set tabgent works when i use the world coordinate mode. it does not work when coordinate mode is set to local. Also in my project i am updating spline at runtime and only thing that does not work is the collision component of the spline mesh component, so have to build the collision component by myself. Is this feature will be supported in future?

Thanks
Atin