...
var handle = true;
        ph.HttpReceiveProgress += (_, args) =>
        {
            if (handle) onDataReceived?.Invoke(args);
        };

        using var client = new HttpClient(ph);
        await client.GetAsync(url, cancellationToken);
        handle = false;
        onDataReceived?.Invoke(new HttpProgressEventArgs(-1, null, 0, 0));
...

...
var handle = true;
        ph.HttpReceiveProgress += (_, args) =>
        {
            if (handle) onDataReceived?.Invoke(args);
        };

        using var client = new HttpClient(ph);
        await client.GetAsync(url, cancellationToken);
        handle = false;
        onDataReceived?.Invoke(new HttpProgressEventArgs(-1, null, 0, 0));
...

...
Dispatcher.Invoke(() =>
                {
                    if (args.ProgressPercentage == -1)
                        OverallProgressBar.IsIndeterminate = true;
                    else
                    {
                        OverallProgressBar.IsIndeterminate = false;
                        OverallProgressBar.Value = args.ProgressPercentage;
                    }
                    parent.TaskbarItemInfo.ProgressValue = args.ProgressPercentage / 100f;
                });
...

...
Dispatcher.Invoke(() =>
                {
                    if (args.ProgressPercentage == -1)
                        OverallProgressBar.IsIndeterminate = true;
                    else
                    {
                        OverallProgressBar.IsIndeterminate = false;
                        OverallProgressBar.Value = args.ProgressPercentage;
                    }
                    parent.TaskbarItemInfo.ProgressValue = args.ProgressPercentage / 100f;
                });
...