Changing MathTex default color does not change y-tick colour in BarChart

config.background_color = WHITE
class graphing (Scene):
    def construct(self):
        Text.set_default(color=BLACK)
        Tex.set_default(color=BLACK)
        MathTex.set_default(color=BLACK)
        config = {"color": BLACK, "decimal_number_config": {"unit": "k"}}
        
        bitcoin = pd.DataFrame({"Date":[2019,2020,2021,2022,2023,2024], "Price (USD)":[8000, 12000, 18000, 12000, 17000, 2]})
        nasdaq =  pd.DataFrame({"Date":[2019,2020,2021,2022,2023,2024], "Price (USD)":[8000, 12000, 18000, 12000, 17000, 2]})

        
        ax = BarChart(
            values=bitcoin["Price (USD)"].to_numpy(),
            bar_names = bitcoin["Date"],
            y_range = [0,bitcoin["Price (USD)"].max(), round(bitcoin["Price (USD)"].max() // 10,-3)],
            y_length = 6,
            x_length = 6,
            x_axis_config= {"font_size":36},
            bar_width = 0.5,
            axis_config = config
        )
        
        ax2 = BarChart(
            values=nasdaq["Price (USD)"].to_numpy(),
            bar_names = nasdaq["Date"],
            y_range = [0,bitcoin["Price (USD)"].max(), round(bitcoin["Price (USD)"].max() // 10,-3)],
            y_length = 6,
            x_length = 6,
            x_axis_config= {"font_size":36},
            axis_config = config
        )
        
        grouped = VGroup (ax,ax2).arrange(RIGHT).scale(0.8)
        bitcoin_label = Text("Bitcoin $",font_size = 20).move_to(ax.get_axis(1).get_critical_point(UP)).shift(UP/2)
        nasdaq_label = Text("Nasdaq $",font_size = 20).move_to(ax2.get_axis(1).get_critical_point(UP)).shift(UP/2)
        year_label = Text("year", font_size=20).move_to(ax.bars[2],DOWN).shift(DOWN)
        y2_l = year_label.copy().move_to((ax2.bars[2].get_critical_point(DOWN) + ax2.bars[3].get_critical_point(DOWN))/2).shift(DOWN)
        bitcoin_plot = ax.plot(lambda x: 8000 + (x*sqrt(2000))**2, x_range = [0,4.235])
        nasdaq_plot = ax2.plot(lambda x: 8000 + (x*(nasdaq["Price (USD)"].iloc[-1] - nasdaq["Price (USD)"].iloc[0] +800) / nasdaq.shape[0]), x_range = [0.15,5.5])
        self.add(bitcoin_plot)
        self.add(nasdaq_plot)
        self.add(year_label)
        self.add(bitcoin_label)
        self.add(nasdaq_label)
        self.add(y2_l)
        self.add(grouped)