I know the AI isn't superb, but I hadn't seen this before.
Three AI cars crash into each other, and even when the first is free, he doesn't continue driving.

Starts at about 3:15. Follow the first AI (don't know if replays save AI names, but if so: he's called Hans).

Maybe he broke his neck after the crash and couldnt continue racing ??? Realistic man , realistic

The AI was short on its fuel(0,2% left), that's why it decided to stop its car on the chicane, as they still don't know how to go to the pits at so3(and at so2 and fe6 too). I thought it was supposed to follow the path at this moment but obviously no, so, it kept turning left, hit the barrier and then stopped the engine. Its car was still on the path though, so that's why the other AIs hit it, as they're currently programmed to follow the path in every situation.

So, known bug, due to the impossibility to the AI to go to the pitlane on short tracks.