MVVM Razor page refresh (F5) produces error System.ObjectDisposedException

Question

Target is to start a long running background task entering the Razor page. Changes done in the database by the background task are updated in the table of the Razor page.

I can change the menue on the left and can go back to the page. But when I hit F5 during page is running, I get the following error: System.ObjectDisposedException: 'Cannot process pending renders after the renderer has been disposed. Object name: 'Renderer'.'

I don't know if the approach taken is completely wrong and if it must be done in another way.

I expected starting a fire and forget task in the Razor page doesn't harm the page (razor page):

protected override async Task OnInitializedAsync()
{
    ViewModel.PropertyChanged += async (sender, e) =>
    {
        await InvokeAsync(() =>
        {
            StateHasChanged();
        });
    };
    await base.OnInitializedAsync();

    if (!ViewModel.IsBusy)
    {
        _ = Task.Factory.StartNew(ViewModel.AddItems);
    }
}

Method in the ViewModel:

public void AddItems()
{
    IsBusy = true;

    CancellationTokenSource stoppingToken = null;
    stoppingToken = new CancellationTokenSource();
    CancellationToken token = stoppingToken.Token;

    for (int i = 0; i < 10; i++)
    {
        List.Add($"{i}");
        OnPropertyChanged(nameof(List));
        var cancellationTriggered = token.WaitHandle.WaitOne(1000);
    }

    IsBusy = false;
}

An example to reproduce the problem you can find here: enter link description here