The boolean "bRunPhysicsWithNoController" has an attached note that reads:
" * Normally without a Controller, movement will be aborted and velocity and acceleration are zeroed if the character is walking."
However, the results from setting the boolean to true will zero out the velocity which is not the behavior described in the description.
Result: The previously controlled player character is running in place.
Expected: The previously controlled player character to have had the velocity zeroed and the movement to be idle even without a controller or the "bRunPhysicsWithNoController" boolean set to true.
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-80429 in the post.