An unintentionally hilarious bug in the early days of pcars public release when in an online session at the start of the race every racer got a pit lane penalty for jumping the start, despite not doing so. After taking the unwarranted penalty, for some bizarre reason you were black flagged anyway and your race was over, a number of rage posts in the chat, let the hilarity ensue.
Live For Speed had some beauties over the years, I guess I saw them more because I mostly played on cruising servers, but the barriers for a long long time would send you skyward if you so much as clipped them. Also occasionally when starting the engine you get a REALLY loud buzz for half a second.
My family had a Dragon 32 PC in the 80's. There was a track and a block representing you. If you hit the reverse arrow key you would get the fastest lap time as it let you go in reverse. It did not know this is cheating
The question was about strange bugs in sim racing and half the comments are just mindless hating on Project Cars games, not even mentioning ANY bugs related to them. I don't know what's going on with this community. I wouldn't call it a "sim racing community" anymore, just a PCars hate group. This is so sad....