Same. Parking brake set for all RTOs here. Airplane could move under certain conditions (slope, weight, surface condition) or you just happen to be flying an airplane with incredibly high idle (737 MAX) that moves under idle thrust at most weights.
Get the airplane stopped, prevent it from moving, focus on identifying and solving the problem and only then consider releasing the parking brake. Last thing I want following an RTO, is to keep looking outside if the airplane is moving or not.