Have filed a bug-report to Support without verifying first whether it's actually non-mod related. Don't think so really, because as far as I know, it's been in the game ever since launch. Nevertheless, have to ask.
Do the lights of other vehicles turn off too in your vanilla game when they come into close proximity of you?
Of most vehicles, when in the distance, (not the 2D cars), they have lights. But when they come closer, their lights go out. It happens so often, that it looks intended. But have already seen it a couple of times, that their lights turn on again, despite they being close to you. So that tells it's NOT intended, but a bug. Can witness it in the vid below.
Do the lights of other vehicles turn off too in your vanilla game when they come into close proximity of you?
Of most vehicles, when in the distance, (not the 2D cars), they have lights. But when they come closer, their lights go out. It happens so often, that it looks intended. But have already seen it a couple of times, that their lights turn on again, despite they being close to you. So that tells it's NOT intended, but a bug. Can witness it in the vid below.