removing polysurface edge when intersecting with 3d voronoi cells

hello dear dear forum!

I am using the definition of Vicente Soler (thanks a lot bty) from this discussion in order to populate brep with 3d voronoi cells. 

my problem is that i am getting also meshes where originally where the polysurface edges (pink in the attached picture) because they are intersecting with the cells as well.

who can help me with an idea how i can prevent from getting the intersection with those edges? 

i have used a simple form for demonstration but my real polysurface has alot of sharp edges because initially it was created from mesh. 

maybe i can manipulate the initial mesh somehow?

thank a lot for all the rightchess people