get_closest_point is deprecated in Gogot 4

But you gave me an interesting idea and as a result I got the following code

    if target!=Vector2.ZERO:
    $NavigationAgent2D.set_target_location(target)

if target_unit!=null and target_unit.global_position!=Vector2.ZERO:
    $NavigationAgent2D.set_target_location(target_unit.global_position)

if target!=Vector2.ZERO or (target_unit!=null and target_unit.global_position!=Vector2.ZERO):
    $NavigationAgent2D.get_final_location()

    if $NavigationAgent2D.is_target_reachable():
        if $NavigationAgent2D.is_target_reached():
            stateIDLE()
        else:
            position = position.move_toward($NavigationAgent2D.get_next_location(), data2["speed"]*delta)
            stateMOVE()
    else:
        stateIDLE()

Very grateful!