Voronoi fracture produces false chunks from mesh with shell operator

[Alexx31]

Hello,

I have a mesh with a thin shell operator. It should be fractured with voronoi.

Unfortunately the voronoi is not just fracturing, it is producing some false single chunks as if there was no shell operator before.
When I slice the tyflow mesh, I can see that shell works properly but fracture thereafter causes the failures.

With a very simple mesh (tested a teapot) this doesn't happen

   

Thanks for advice