Rigidbodies parenting very buggy or doing something wrong?

In this scenario I am parenting rigidbody1 to a player rigidbody2, turning on kinematic and off interpolation.

What happens then is where the rigidbody1 used to be before parenting seem to interact with rigidbody2 and I see the collision vectors being drawn to nowhere.

Has anyone experienced this as well ? Is this a bug or some obscure by design function designed to make me smile ?