I did a 90min gt3 endurance race at spa classic earlier. With about 20mins to go a Porsche crashed/span on the start finish straight. It was obviously incapacitated as it couldnt move but it stayed in the middle of the track causing the AI to pile up around it almost every lap. Completely ruined the race
Had the same problem, did a 20 min race with Porsche 911 Cup and Cayman CS Cup at Norisring. There was a crash at one of the hairpins and the car was not removed for the whole race.
Same for me, racing 30 laps on Monza and an AI car has crashed into the wall in the last big chicane in the middle of the race; white flag through the rest of the race and the competition was over for my part. Though I noticed I raced with flags option off (forgot to set it to complete), I am not sure if that will solve the problem.