Parenting the RigidbodyFPSController to a rigidbody go crazy

Hi!

As the title say when I try to attach the Rigidbody FPS Controller (with IsKinematic set to true) to an object with the rigidbody component, the player and the object start to glitch and fly everywhere. My goal is to freeze the FPSController and attach it to a rigidbody object. What can i d to fix this?

Remove the collider of the rigidbody fps controller when it’s attached to the parent.