Another method which is sometimes successful, is to use the drafting palette but it requires more work.
Select object, use drafting palette with the correct face selected using the palette icons. drag the resultant drafting object into drawing, explode once. The biggest drawback is that, often the rounded arc corners and circles are converted to two arcs. But providing TC has converted to arcs and not splines, one can then use join polyline with 'auto' selected on the inspection bar. (my view - never use join polyline on a spline).
To be honest, the other methods posted above are often quicker, I'm just posting this as another alternative.