Async events firing out of expected sequence.

public async Task StopService() {
    if (this.service is null) throw new NullReferenceException();

    await this.service.StopAsync();

    this.service.Dispose();
    this.service = null;

    this.logStream?.Flush();
    this.logStream?.Dispose();
    this.logFileStream?.Dispose();

    OnPropertyChanged(nameof(ServiceRunning));
    OnPropertyChanged(nameof(CanServiceStart));
}

public async Task StopAsync()
{
    if (this.cancellationTokenSource is not null) await this.cancellationTokenSource.CancelAsync();
    this.listener.Stop();
    OnMessage(this.listener.LocalEndpoint, $"{Name} Service Stopped.");
}