Season 11 has just finished and just noticed that although my driver won the championship, he was not awarded the DC. I had another driver who was leading for about 11 races and then I sold him and my other driver who had now become the new leader had not raced from the start of the season due to him only being promoted half way through the season. Perhaps this is the reason for this the particular bug?
I also checked the driver that I had sold to see if he had been awarded the DC but he had not. In fact, nobody at all was awarded the DC for season 11.
https://igpmanager.com/app/p=standings&season=11&tier=3&tab=drivers
https://igpmanager.com/app/p=league&id=17071
Driver who should have been awarded the DC
https://igpmanager.com/app/d=driver&id=3345925