All Tracker Points Group Together

[SuperUser-Vermeylen]

I'm expecting individual points to FadeIn at their respective locations, but it appears they all aggregate at the last tracker point.

class Complex_Dots_with_Labels(Scene):
    def construct(self):
        def label_value_and_position(mobject):
            position_string = "{0:.1f}{1}{2:.1f}i".format(tracker.get_center()[0],
                                                          '+-'[tracker.get_center()[1] < 0],
                                                          abs(tracker.get_center()[1]))
            mobject.set(submobjects = [SingleStringMathTex(position_string)])
            mobject.next_to(tracker)

        plane = ComplexPlane().add_coordinates()
        tracker = [ComplexValueTracker(np.sign(r)*(2*r**2)**(1/2)*np.exp(np.pi/4*1j)) 
                   for r in np.arange(-2,2.5,0.5) 
                   if abs(r) != 0.0]
        dots = VGroup(*[Dot(color=WHITE, radius=0.1, name = 'Dot_{}'.format(i)).add_updater(lambda x: x.move_to(tracker[i].points)) 
                        for i in range(len(tracker))])

        
        anims = []
        for d in dots:
            anims.append(FadeIn(d, scale = 2))
                 
        self.play(Write(plane))
        self.play(*anims)
        self.wait(1)

How to place the dots at their specified locations?

Complex_Dots_with_Labels.mp4