Yes, I figure it was too difficult for the engine to calculate the shape of chicanes on the fly, so they just made the four tiles physically asphaltic. Chicanes also have another special bug regarding terrain: when on water, the primary tile will behave like it's on grass whereas all tiles will look like on water. This is contrary to other multi-tiled track elements, which will have their primary tile look like it's on grass but behave normally if on water.
There is a bug in the beginning of the track
When you go to the chicane, then you can go straight to the end, because the car still accelerate in the grass, and thanks for that, it's faster
Dark Chaser will be away for 14 days too...
@CTG: I don't think this World Cup is all that bad -- in particular VAR has been less dreadful than I feared. In my eyes, 2010, for one, was clearly worse than this edition. The main problem this time is perhaps the lack of truly outstanding teams (I feel the tournament is a little bit, as we say in Portuguese, "nivelado por baixo").
Have a good holiday, Seeker! And Cas: sounds promising