Ok. So after dragging the slider I see that there are errors
ValueError: expected an element of Dict(String, Any), got <pyecharts.charts.basic_charts.bar.Bar object at 0x0000024F8E8DAE08>
And I can see a bug report has been filed https://github.com/holoviz/panel/issues/1874
And I’ve contributed a fix here https://github.com/holoviz/panel/pull/1875