Sounds promising. I'll try to test it myself at the weekend. Hopefully they fixed it before releasing the new weather effects.
I first noticed this bug in 2013, with the release of Loch Drummond. Now that 397 seem to be wanting to promote the weather features of rF2 more, I'm hoping this AI issue is raised higher up their priority list.
I came across something interesting the other day. When I would do a wet race with the ai, the usual bug happens. However if I ‘restart’ the race, it doesn’t. Worth trying out if anyone is interested in this.