String Won't Update and Dot is Glitching

[SuperUser-Vermeylen]

I have no idea why the dot is fluctuating and I have not been able to render the string at all AND have it update to it's final location.
I don't know why the complex numbers aren't as simple as the example here, but I can't get this to FadeIn then update to it's final location.

point1 = 50

Text.set_default(color="#FF40FF", font="Vollkorn", font_size = point1)
MathTex.set_default(color="#FF40FF", font_size=point1, tex_template=TexFontTemplates.fourier_utopia)
Mobject.set_default(color = "#FF40FF")

config.disable_caching
config.flush_cache

class font_size(Scene):
    
    def construct(self):
    
        class tracker_dot_label:

            def __init__(self, pos):
                self.tracker = ComplexValueTracker(pos)
                self.dot = Dot(point=[self.tracker.get_value().real,
                                      self.tracker.get_value().imag,
                                      0.],
                               color=WHITE, 
                               radius=0.1).add_updater(lambda x: x.move_to(self.tracker.points[0]))
                self.label = MathTex('').add_updater(self.label_value_and_position)
                
            def label_value_and_position(self, label):
                position_string = '%0.2f% +0.2fi' % (self.tracker.get_value().real, self.tracker.get_value().imag)
                self.label.set(tex_string = position_string)
                self.label.next_to(self.tracker.points[0], direction=RIGHT)
                
        plane = ComplexPlane().add_coordinates()
        test_dot = tracker_dot_label(2*np.sqrt(2)*np.exp(np.pi*1j/4))
        
        self.play(Write(plane))
        self.wait(1)
        self.play(FadeIn(test_dot.dot), FadeIn(test_dot.label))

        self.wait(2)
        self.play(test_dot.tracker.animate(run_time=2).set_value(test_dot.tracker.get_value()**(-1)))
        self.wait(1)

font_size.mp4