I never really did play TSW much until ECW came out. Then I've spent quite a while driving different routes with different traction. When I first played ECW when it as launched, I noticed the sun was reflecting on the inside of the windscreen when the sun was directly behind, which I thought was odd but maybe was just a TSW thing. But it definitely seems to be a bug with ECW / The 377 though. See the screenshots below. No way would the sun be reflecting off the inside of the windscreen at that angle.
Thats been present since Great Western Express, and because that route is east/west it renders any morning run towards Reading essentially unplayable from an immersion point of view. Disappointing that its still there.
Oh has it? Like I said, I briefly played TSW when it came out but quickly went back to TS, only to return to TSW when ECW came out, I haven't noticed it on the German routes. Either way, it's pretty annoying.
If its not in the German routes then it implies a solution has been found that has not been universally applied. As you say, annoying.