Real Weather turns itself off after a while

When I tick "real weather" and choose a city, the weather is set, but after one or two runs when I check the setting again at the bus terminus, the box is unticked, so real weather tends to turn itself off. Or is it by design?

I noticed this as well. It seems that the real weather option automatically disables itself if you adjust any setting within OMSI's options. I believe this is a bug.