Just noticed the video. It’s definitely by design. It’s not a bug
COTA is certainly challenging this year because of this. It's not totally unrealistic in that it's obviously totally possible to be blinding by sunlight when driving a real car but the issue is it happens at the supposedly realistic time of day and the real-life conditions the drivers face aren't the same. In game it's best to just choose to race at a different time of day I think.
There's about a 0% chance of the game being modified in relation to this now, although hopefully it's an aspect that will be born in mind for next year.
