I just updated to v0.9 and did a race at Oulton Park in the Roco. At the end of the race I drove the cooldown lap then entered the pits. The AI took over driving in the pitlane then drove back out onto the track and drove two more cooldown laps, so I pressed ESC to end the session. At the end of a race I usually watch the replay so that I can record it, but in this case I was unable to watch the replay (apart from the last lap) because the race continued with the AI stuck in a never ending loop of cooldown laps???
I had the same driving a kart. After the race I entered the pit. There came a message saying 'Pit busy'. So the AI never stopped but drove (doing 2 laps) until the kart was out of fuel.