Please excuse me if this topic has already been discussed, I couldn't find anything about it in the search. On Donington Park, Grand Prix layout, the next lap is shown as invalid if you cut turn 9 or 10 (all cars). Since cutting turns 9 and 10, unlike turn 11, doesn't provide any advantage for the next lap, I don't understand this...
Afaik this is related to where the car spawns in leaderboards/competitions. Any off track after that point will invalidate the next lap. So unless that whole system is reworked all that can be done about it is to change said spawn point (which in the case of donington might be feasible tho)