I am not sure you can reproduce this 100% of the time, but I got it already 3-4 times since 1.6. How to reproduce : - Create a single race with Real Weather or Random Weather. - Wait until condition changes from dry to wet (or contrary). - Have all cars go to the pit change their tyres. - Pause the game and watch an instant replay. - Resume the race : track will be back at initial condition from start of the race. This is "game breaking", as after resuming everyone will be on incorrect tyres. I also got it already in practice sessions when returning to the pits (which is less of a problem but still). Edit : I could salvage a bit of the replay of the exact moment it happened, you can see the track changing back from dry to wet at the 8s mark (when I quit the replay and resumed the race).
Watching an instant replay (and skipping a session to the end) will reset the livetrack status. This has already been the case in PCARS 2. It also resetting the weather is surprising and I'm not sure if it already happened in PCARS 2 but it "makes sense" in that context.