I was racing on-line at Spa in the Vintage mod during a qualifying session and hit hay bales on the left side of Eau Rouge that caused them to lay across the track. When I escaped to the pits and went back out on track the image of the hay bales (three of them) were still across the track but were able to be driven through without damaging the car or changing my trajectory.
Thanks, yes this is a known issue. (It's even mentioned in the file KnownIssues.txt that resides in the root of the install directory, next to the Launcher executable.)