For people that may have the same issue as I have. It was/is the “hardware raytracing”
If you disable that the datasmith import doesn’t crash anymore.
BUT even after importing all your C4D files you cannot turn hardware raytracing on again.
It will ask you to restart the engine and after that everything will crash at the start again.
I had to change an .ini file to even get back into my project.
I don’t know this seems kind of a bug. I don’t really understand why you can’t find anything about it on google.