World Driver Championship used to work with this core but when i tried it yesterday, it didn’t. It now shows a black screen. I thought i must have done something that caused this but no, if i just use an older core without changing anything else, the game works.
The most recent core i found that works is from this 1.20.0 pack: https://buildbot.libretro.com/stable/1.20.0/windows/
The above cores are from January this year. If i use the core from the 1.20.1 stable, which is from April, the game won’t work.
So, the regression must have happened between January and March (there aren’t any commits in April). Thankfully there are just a dozen of commits in between so someone would be able to narrow it down and find which caused this.