Inconsistent 3D Voronoi

I played around with some voronois in different Breps.
By creating a voronoi inside a more curvy object, some voronoi cells are missing after intersecting the voronoi and base geometry.
Do anybody know why the intersection process does not work as intended?
I tried some Breps and the problem only occured by working with this specific one. (14.8 KB)

If you provide slightly bigger bounding box than previous one, then it should work. (19.3 KB)