In every year of our 2 player career mode, we have the same bug in Hungary. We play on Medium race length.
The race is always wet, from start to finish, according to the weather information. It is raining, and clearly wet from the grip conditions, but DRS is enabled immediately and throughout the whole race.
The intermediate tyres are the only viable tyres, but Mark tells you from lap 1 that dry tyres seem to be the fastest. If you actually try dry tyres it's completely impossible to do a lap anyway near the Inter pace - just keeping it on the road is a huge challenge, and it's over 10 seconds per lap slower.
However, the Intermediate tyres overheat rapidly. Within a lap or 2 at racing speed, temperatures sky rocket and tyre wear reaches 60% by lap 15 / 25; it makes a 1-stop impossible.
On lap 21 / 25, Mark will tell you you'll be running on a dry track soon, and on lap 24/25, half of the AI drivers will pit for dry tyres and knock themselves out of the top 10.