What is causing my figures to be invisible when I switch to a detached screen

Question

Can't see pyplot figures when on a detached screen

Pyplot figures were visible when on attached screen and I expected its behavior to not change. It did.

Code I'm using for the plots:

    def plot(self, _):
        def total_seconds(fecha):
            return (fecha - time_limit).total_seconds()

        df = self.df.copy()
        df['fecha'] = df['fecha'].apply(to_datetime)

        dias = int(input('Días de búsqueda (Ilimitado): ') or 0)
        if dias > 0:
            today = erep_time()
            time_limit = today - timedelta(days=dias)
            busqueda = df[df['fecha'] > time_limit]
        else:
            time_limit = df['fecha'].min()
            busqueda = df

        fecha = busqueda['fecha']
        fecha_dif = busqueda['fecha'].apply(total_seconds)
        ccp_g = busqueda['ccpG']

        trend = np.poly1d(
            np.polyfit(fecha_dif, ccp_g, 10)
        )

        plt.figure(figsize=FIGSIZE)
        plt.scatter(fecha, ccp_g, color='k', marker='o')
        plt.plot(fecha, trend(fecha_dif))
        plt.xticks(rotation=90)
        plt.ylabel('cc/G')
        plt.title('Historial MM')
        plt.show()

Answer 1

As Wayne pointed out, the output from matplotlib won't be handled by any channel, since it is a detached screen.