Grasshopper + Rhino Beta -> Whats happened to NGONS?


I have two lists of polylines, and from those lists I create ngon meshes.
After Rhino Beta installation something went wrong with display from Grasshopper.

If I create ngon mesh from one list of polylines display is correct.
If I input datatree, or two lists, meshes are still correct but display is only shown in wireframe why?

Code attached. (24.5 KB)