Need Help with exporting Splines to DXF

Hi there,

I am struggling to export the spline correctly into dxf. Splines have always this "connect spline" function. The problem is this only shows the connecting segment in C4d. When exporting as dxf this last connecting segment is always missing. Manually adding this last missing spline segment by drawing this missing piece always activates the "connect spline" function and situation loops back to original problem. How to solve this?