It sounds like I am also having a similar problem,
I have a blueprint with a Sphere component set as the rootComponent, I want to be able to add two physics bodies inside the sphere and run a physics constraint between them.
Body 1 is set to not simulate physics and body 2 is set to simulate bothignore collisions.
However when I run the 2nd body is stuck at world 0,0,0 whilst the sphere and the 1st body simulate as expected.
Any helps would be greatly appreciated.
Thanks!