Board Thread:Game Discussion/@comment-29746749-20190319184621/@comment-28169398-20190324160534

Gwilbor wrote: The leak wasn't from the gamechangers, but from the hackers that explored the game files! Yep. That was FM's mistake. The IMSA GTD update was completed before the NASCAR update and someone uploaded the Team Challenge information and they forgot to remove it when they packaged the NASCAR release.

All it took was someone to time travel to get to see what the TCs were. That is still the way that information gets released before it triggers in the game, even for a current release.

Given that the studio was in a state of turmoil during that period, you can understand the oversight.