This year's edition of the GT Academy, a long-running competition that has now been turned into a TV show, is in a bit of a mess after so many people were caught cheating, the last round was called off.
First picked up last week, there was a "loophole" which users had discovered which allowed them to cut corners on the competition's chosen track. When organisers discovered this, another track was chosen instead, only... the same problem returned. People found that cutting corners was giving them an unfair advantage over those sticking to the track.
This being a game about racing on tracks, and not racing off roads, qualifying round 2 of the competition (we're obviously still in the online stage and not the "racing real cars on TV stage") has been scrapped entirely, all results binned, and all entrants will be moving onto round 3.
Polyphony Digital is now working on an update for the game that will hopefully curb this behaviour.