Rigidbody.MoveRotation Stop rotating when parent moves!

Unity Engine
1

Hi guys!

I am having a problem when i try to rotate a RigidBody(Red Cube) that is child of other Cube(Blue Cube), that isnt a kinematic rigidbody, and start to move it(Blue Cube - Parent of Red one). Then red cube stops to move and only return to rotate again when the blue one stop`s to move.

Is that some king of a bug??

Thx in advance!

Imagine something like this:

2

Hi, i still have the same problem.

Does anybody khows how to solve this?