I was performing a service on the RRO route, all was going well until I stopped at Hagen-Westerbauer, selected the external camera to watch my precious passengers unload from the train and saw the weirdest thing I've ever seen in TSW. At first I confused them with clouds, but after observing them well, it is clear that they are not.Like a mass of super white (dazzling even) mashed potatoes and giants over the mountains. Have you ever come across these things? What will they be?
I´ve seen something similar. I think it was MSB. I started the service in the higher part of the route where it was snow and as I transitioned toward downhill and losing the snowcap some assets were still showing fully white color while in the middle of a green area, something very similar to what you observed. It is only present as you crossover between zones with different weather.
i have seen that effect on sand patch too it is a somewhat bugged snow effect since this only happens at the winter month's