Power summariser: what shall happen, if I feed power to the grid?

[JirikiAiki]

Hi all, I use the power summariser for my Pulse (Tibber) and it seems to work fine. I just realised that when I feed power to the grid (PV) my pulse shows negative values and PBTH just zero. That would be fine for the cost calculation, especially as some guys requested a non-negative solution.
But as I did not find anything about that in the description, I was a bit astonished. Do I miss something I can adjust in the configuration or settings - or is it just like that negative power always is neglected?
So probably there might be a positive-only and added a negative-only device to have both?