How do I implement Dash/Plotly Checklist Persistence on a layout with multiple unique graphs?

My dashboard has a 2 x 2 graph layout with one checklist overlaid on each graph.

Each graph requires a unique ID, to be live-updated via callback. These IDs are generated in a loop (e.g., graph-BMW, graph-MB, etc.). Similarly, each checklist has a unique ID generated via the same loop (e.g., checklist-BMW, checklist-MB, etc.). These IDs are passed to the Input and Output of the callback.

Graph data is calculated and the checklist value and figure are returned.

Since the checklist needs to be contained in the same DIV as the graph, they are nested and then unpacked in the layout.

All of this works perfectly, with one exception: persistence doesn't work. If a checklist is clicked, I'm unable to retain the current (new) state when refreshing the page. The checklist value always returns to unchecked, as it seems to be reset.

Do you have any ideas of how to resolve this? Happy to provide more info.

A stripped down version of the app:

cars = ['BMW', 'MB', 'AUDI', 'FIAT']

app3 = dash.Dash(__name__)

for car in cars:
    graph = 'graph-' + car
    checklist = 'checklist-' + car

    @app3.callback(Output(checklist, 'value'),
                   Output(graph, 'figure'),
                   Input(checklist, 'value'),
                   Input('interval-component', 'n_intervals'))
    def update_charts(checklist, n_interval, c=car):
        data = get_car_data(c)
        df = calcs_on_car_data(data)

        fig = go.Figure(go.Scatter(x=df.index, y=df['A'].values))
        return checklist, fig

list_graphs = []
for car in cars:
    list_graphs.append([html.Div(className='box',
                                 children=[html.Div([
                                     dcc.Checklist(id='checklist-' + str(car),
                                                   options=[{'label': '', 'value': 'on'}], value=[],
                                                   persistence=True),
                                     dcc.Graph(id='graph-' + str(car))])
                                 ])
                        ])

app3.layout = html.Div([
    *[j for i in list_graphs for j in i],  # unpacking a nested list
    dcc.Interval(id='interval-component', interval=300000, n_intervals=0)
])

if __name__ == '__main__':
    app3.run_server(debug=True)

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