Spotted following issues:
* Quali programme - I couldn't make it even to green during 3 attempts, ended up with the best time +0.8s over target but interestingly, I was awarded purple achievement. How?!?
* Wet race in Zandvoort: started on Full Wets with all AI drivers. Ten laps in, rain eased, Jeff said Interns and Wets are same, so I pitted for Interns. AI stayed on Wets even I was lapping a second faster than rest of grid. They pitted during SC seven laps later, also for Interns. Rain stopped, track dried slowly. Jeff reported it's crossover for dry in Weather Report about 8 laps to go. I pitted for Mediums, came back 10th and started lapping 2secs faster than top dog. I ended up winning the race with Haas (sixth car in list) because AI drivers didn't get the message and stuck with Interns till end of race.
That definitely looks like a bug that game doesn't let any AI driver to risk or pit when human player shows faster pace on different tyre.
* Found another cheat AI drivers use 😉
Race in Spa, MT with top car: 8 laps to go, 1st place, Medium tyres, rest of grid on Hards. I notice car behind me closing in. I made the fastest lap, AI drops to 2.1s behind me. Next lap, I am +0.2sec off my fastest (i.e. previous lap), AI behind closes to 0.7sec behind me. He made up ~1.4seconds but fastest lap was still assigned to me! 😉
NB Steam on PC, AI level 90