I have been unable to find a fix even trying all the suggested ones. But today I have finally found a fix for me. It’s the usual way from the past couple of years but I had to unfortunately delete the old two player career, but before I started another one, I went to F1 World > Play > Multiplayer Grand Prix > Create > No ( open ) > settings > lobby settings > change the cars from f1 world to 2023 > simulation settings > equal performance OFF
Then back out all the way to the main menu and create a new two player career but make sure to skip the invite a friend bit, you can do that after you’ve finished setting up the career. I also turned crossplay off, can’t confirm this mattered but hopefully not as a lot of people are playing cross platform.
Silly to have to do but nothing else worked for me till I did this.
