I like new tracks, but I have noticed that rivals in different modes after installing new version drive definitely worse. Even if I crash and bump into scenery I manage to build great distance between them and they do not reduce that distance as fast as they would normally. They used to crash sometimes and bump into other cars, but they also drive fast and used to overtake lead position. Now they are AI dead.

I absolutely agree with you. I've tried it several times in Battle Royale mode with an extremely slow car and also noticed that the AI is much slower than in 1.3.2. Racing is so much less fun. You can at least use modded cars and tracks in the old version, but with restrictions. The Supernova tracks are unfortunately buggy. You can try to correct them, but this is very time-consuming. Better to live with the 25 tracks and better AI.