Hi,
I’m aware of this problem and still have not a good solution for it.
I’ve implemented a new sample called Sample8 that I hope helps you to work around it meanwhile.
You can pick category using the categories combo box (red arrow).
It imports geometry from a 3dm file to a Revit model or family.
The good thing is that you have the source code in the repository to change it as you want, or request here if you need another kind of import, for instance, import objects separately or taking into account its layer, materials, UserText…
I’m all ears.