godot – An object with a rigid body appearing turns like a spinning top

Here is the code of the spawn object that is a rigidbody node:

func spawn_asteroid():
    var spawn_position: Vector3 = get_spawn_position()

    var asteroid_instance = asteroid_scene.instance()
    asteroid_instance.transform.origin = spawn_position
    spawned_asteroids.append(asteroid_instance)

    # Push towards player
    var direction_to_player: Vector3 = player.transform.origin - spawn_position
    asteroid_instance.add_force(direction_to_player * asteroid_speed, spawn_position)

    add_child(asteroid_instance)

There is no add_torque nor any additional code to handle the rotation, however, when an object is created, it rotates like a spinning top.

I first thought that it caused the intersection of two rigid body objects that were pushing and causing rotation, but this was not the case.

I do not know why they turn. Is there anything that I missed? Unlike Unity, there is no way to stop their rotation. Use Godot 3.1.1.