I tried Rhino 6 again after quite some while and had to realise that there are still major problems while importing geometry. How can I rely on a software and not double check without other software to be sure the file content is right. The worsed fear from this is that the whole program might be buggy and I better rely on Rhino 5 so far.
Here is a dwg import from vector works:
Autodesk TrueView: ArcDimensions aren’t supported in Rhino at all
Version 6 SR7
I’ll upload the file here: https://www.rhino3d.com/upload
Please let me know how when the public beta testing is over!