When enabling the Is Kinematic option in the Rigidbody's Component it changes the Collision Detection to Continuous Speculative. Changing it back to Continuous in a Script affects only the value in the Inspector. When changed, the Sphere's Path doesn't match Continuous Collision Detection Path taken by another Sphere but matches the Continuous Speculative one.

How to reproduce:
1. Open the attached project's Scene labeled "SampleScene"
2. Enter the Play Mode
3. Inspect the Spheres in the Game View

Expected result: Gameobjects which have Continuous Collision Detection on their Rigidbodies("PlayerSphereContinuous" and "PlayerSphereSwitchedContinuous") travel the ramp with the same path.
Actual result: "PlayerSphereSwitchedContinuous" follows the path of a GameObject with a Continuous Speculative Collision Detection. ("PlayerSphereSpeculative")

Reproducible in: 2018.4.13f1, 2019.2.13f1, 2019.3.0b11, 2020.1.0a13
Couldn't test with Unity 2017.4.34f1 (Unity crashes while downgrading the project)

Notes:
1. GameObject's Rigidbody's Collision Detection appears to be changed only in the Editor's Inspector
2. If "PlayerSphereSwitchedContinuous" GameObject's Rigidbody's Collision Detection is set to Continuous Speculative before entering Play Mode it follows the correct path when switching the Collision Detection to Continuous during Runtime