Microsoft.JSInterop.JSException: gd.data must be an array

[Boggin]

I'm able to see an example chart in my Blazor Server (dotnet v.7) but I get an exception in the browser after the chart is displayed: "Microsoft.JSInterop.JSException: gd.data must be an array".

Charts.cshtml

@page "/charts"

@namespace Portal.Pages

<PageTitle>My Charts</PageTitle>

<h2>Charts</h2>

<PlotlyChart style="height: 60vh; min-height: 350px" @bind-Config="config" @bind-Layout="layout" @bind-Data="data" @ref="chart"/>

Charts.cshtml.cs

using Plotly.Blazor;
using Plotly.Blazor.Traces;
using Plotly.Blazor.Traces.ScatterLib;
using Plotly.Blazor.LayoutLib;

namespace Portal.Pages;

public partial class Charts
{
    private PlotlyChart chart;
    private Config config = new() { Responsive = true };
    private Layout layout = new()
        {
            Title = new Title { Text = "Scatter" },
            YAxis = new List<YAxis>
            {
                new()
                {
                    Title = new Plotly.Blazor.LayoutLib.YAxisLib.Title { Text = "Scatter Unit" }
                }
            }
        };
    // Using the interface IList is important for the event callback.
    IList<ITrace> data = new List<ITrace>
        {
            new Scatter
            {
                Name = "ScatterTrace",
                Mode = ModeFlag.Lines | ModeFlag.Markers,
                X = new List<object>{1,2,3},
                Y = new List<object>{1,2,3}
            }
        };

    protected override async Task OnAfterRenderAsync(bool firstRender)
    {
        if (firstRender)
        {
            await AddData();
        }
    }

    private async Task AddData(int count = 100)
    {
        if (!(chart.Data.FirstOrDefault() is Scatter scatter)) return;

        var max = (int?)scatter.X?.Max();

        var (x, y) = ChartsHelper.GenerateData(max + 1 ?? 0, max + 1 + count ?? count);

        if (!scatter.X.Any() || !scatter.Y.Any())
        {
            scatter.X.AddRange(x);
            scatter.Y.AddRange(y);
            await chart.React();
        }
        else
        {
            await chart.ExtendTrace(x, y, data.IndexOf(scatter));
        }
    }
}

I'm guessing that there's either a way to swallow this exception or that I've missed something basic with setting up the example.

Any pointers gratefully received.

Note: 'ChartsHelper.GenerateData()' is a copy from the Examples code.