another thing: the same goes for variable width option - it has to be set to uniform for you to get your path as an open path.
if that's a special kind of stroke and you want to keep its characteristics then
you will have to do with a closed path and if its just a matter of trimming you could apply another
path as mask on top which is an open path and use that as your revealing method.Â
for that you could cut and paste the "clean path" from illustrator the same way you did before and use
the stroke effects for that.
guess there are limitations for using "create shapes from vector layer" as an open path to sum it up to your question.