Multiple custom graphics object inheriting from ChartContainer

I am trying to write a custom chart (or graphical object, rather), and I would like to plot several of them in a single figure. I am following this guide, but I keep getting:

Error using matlab.graphics.chartcontainer.ChartContainer

Adding TestChart to axes is not supported. Turn hold off.

In my custom class I am combining a line and a surface, but this a minimal class works as an example:

classdef TestChart < matlab.graphics.chartcontainer.ChartContainer

    properties (Access = private, Transient, NonCopyable)        
        % Chart axes.
        HandleLine(1,1)  %  Handle of the line plot

    end

    properties 
        Axes
        XData double {mustBeReal}
        YData double {mustBeReal}
        ZData double {mustBeReal}

    end 
    
    methods (Access = protected)
        function setup(this)
           this.Axes = getAxes(this);
           % Create line handle
           this.HandleLine = plot3(this.Axes, NaN, NaN, NaN, '-o');
        end
        
        function update(this)
            this.HandleLine.XData = this.XData;
            this.HandleLine.YData = this.YData;
            this.HandleLine.ZData = this.ZData;   
        end

    end

And then, if I try creating two of them:

    a = TestChart('XData', [0 0], 'YData', [0 0], 'ZData', [1 2]);
    b = TestChart('XData', [0 0], 'YData', [0 0], 'ZData', [5 8]);

I get the error saying "Adding TestChart to axes is not supported. Turn hold off.".

Is it possible to create custom graphics object that can be plotted several times in the same axex ?

Thanks in advance!