If you download this track and study it carefully, you will see that the side-track territory consists not only of sand and asphalt, but also of carpets and grass strips and zones. And since there are zones with grass, then before the track is completely ready, the presence of grass fx would be helpful.
Example screen, Start / Finish lane. It is as is. If this an error of modder who made this - all questions to him. Perhaps this is his vision of the track for 2020. I've just only ask about config.