Spatial.clone breaks rigidbodies

It seems that the user object is never set for cloned rigidbodies.

Test code:

import com.jme3.app.SimpleApplication;
import com.jme3.bullet.BulletAppState;
import com.jme3.bullet.control.RigidBodyControl;
import com.jme3.material.Material;
import com.jme3.scene.Geometry;
import com.jme3.scene.shape.Box;

public class Test  extends SimpleApplication{
    public static void main(String[] args) {
        Test t=new Test();
        t.setShowSettings(false);
        t.start();
    }   

    Geometry cloned;
    Geometry original;
    float DELAY=2.f;

    @Override
    public void simpleInitApp() {
        BulletAppState bas=new BulletAppState();
        stateManager.attach(bas);        
        Box b=new Box(10,10,10);
        Material mat=new Material(assetManager,"Common/MatDefs/Misc/Unshaded.j3md");
        

        original=new Geometry("Test",b);
        original.setMaterial(mat);
        original.addControl(new RigidBodyControl(0));
        rootNode.attachChild(original);
        bas.getPhysicsSpace().addAll(original);
  
        cloned=original.clone();
        bas.getPhysicsSpace().addAll(cloned);
        rootNode.attachChild(cloned);
    
    
    }

    @Override
    public void simpleUpdate(float tpf){
        DELAY-=tpf;
        if(DELAY<=0){
            DELAY=2.f;
            if(cloned.getControl(RigidBodyControl.class).getUserObject()==null){
                System.out.println("/!\\ Cloned RigidBody has null user object");
            }else{
                System.out.println("Everything is fine");
            }
        }
    }
}

Full gradle project: http://bit.ly/2APrAGN

$ gradle execute
[...]
/!\ Cloned RigidBody has null user object
/!\ Cloned RigidBody has null user object
/!\ Cloned RigidBody has null user object
/!\ Cloned RigidBody has null user object

Start by running the supplied Gradle project with gradle execute and tracing Spatial.clone together with RigidBodyControl cloning. Verify how the cloned rigidbody's user object is initialized, then rerun the reproduction and confirm it no longer prints the null-user warning.