Yes the default sprint strategy is bugged. The game suggest you use your soft in sprint which means you have no mandatory soft in feature race anymore. 1 soft is for quali and 1 soft for feature race.
So only 1 hard in sprint. Manually set it to one hard and all bugs are fixed.
I assume its the same for full race or half race. The workaround is to just manually edit the sprint strategy to 0 stop of the hardest compound.
Not only is 0 stop 1 hard standard for sprint race, but its actually also the fastest and best strategy. So the game default strategy for sprint race being all wrong is the only bug and its what is causing the bug of entering feature race with worn tires and all the weird impossible non existing tyres popping up.
If you manually set sprint strategy to 0 stop of the hardest compound, all is fixed. ai. and player. all tyre allocation becomes feasable and its all fair race. This should already be a standard strategy but maybe the developers forgot to set it correctly.
A.I. nor player can do a sprint race with just one soft and so if they pit, they lose 26 seconds. But even if they can, they wont have any soft left for feature race.
sprint race is short, it is standard 0 stop fresh set of hard. That leaves 1 hard and 1 soft for feature race.
Manually editting sprint race to 0 stop 1 of the hardest compound, fixes all tyre allocation bugs. The A.I. will do the same, they will copy your strategy if you do 0 stop 1 hard sprint strategy, because it is not only the fastest but it is actually the only possible strategy on Formula 2. According to the tyre allocation, you got 2 softs and one is for quali and one for feature race. Because you mandatorily need two different compounds for the feature race, you are thus obviously not allowed to use the soft in sprint race. But the games default strategy is bugged. And it also causes feature race to be bugged.
So just manually editting sprint strategy to 0 stop of hardest compound fixes all f2 career races.
It should be opposite. Using the hardest (hard/medium) compound available during sprint race, with zero pitstops. That fixes all tyre allocation bugs.
If you do a 1 pitstop and use two tyres, the feature race becomes bugged.
So to fix this is very simple. Simply manually edit the sprint race strategy that has medium/hard in it. And remove the soft or supersoft. And the f2 career game is fixed. no more bugs.
on long runs 50% you say ? because in the long races the main strategy in sprint is already a hard/medium, and I don't stop in the sprint, I go to the end with a set of tires. in the average races of 35% the main strategy is to use soft tires in the sprint with 0 stops, this strategy is the same for the AI and if I set it to go with hard/medium in the sprint the AI will go soft.
