'How to invoke a function when changing position?

I'm trying to invoke a function everytime the position of a position2D node is changed

I tried to override the setter as given in the docs like this:

extends Position2D
tool

func set_position(value):
    print("changed position ",value)
    self.position=value;

what am I missing here? is there a way to achieve what I'm trying?

godot gdscript

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