Hi thanks for your anwser.
The example was just a simple CSG model and apply multiple basic collision shapes is not a option for me.
The CSG models are procedual generated and can have a complex shape.
I need to extract the final result out of a CSG operation to build the exact collision shape.
It looks like it is a gereral bug in Godot, i tested with a imported meshes and generate a trimesh shape as collision shape from it.
All Ridigbodys with a trimesh shape not interact with it self, but build a concex shape it works.
Use a convex shape is not exact enough, and i found some differences between the implemented Physics engine (GodotPhysics, BullettPhysics).