how to split a close polygons in its indivual parts

I created a few polygons  with topologybuilder and now i need to explode them in order to test some line on line with another feature.

ive tried chopper which works greate except the fact that converts the arc in polygons to line and ruins everything.

so how do i split these close polygons back to lines and arcs?

ivre tried GeometryPartExtractor to filder out arc but the results are arcs and rest of the polygon insted of being a polyline without that part it convert it in cloed polygon