given CancellationTokenSource is disposable. is it a problem to not have it being disposed?

public static class TimeSpanExtensions
{
  public static CancellationToken ToCancellationToken(this TimeSpan timeout)
  {
    var cts = new CancellationTokenSource(timeout);
    return cts.Token;
  }
}

https://learn.microsoft.com/en-us/dotnet/standard/threading/cancellation-in-managed-threads

You should be sure to call the CancellationTokenSource.Dispose method when you have finished using the cancellation token source to free any unmanaged resources it holds.