This Bug is for the Series 30: Spring event: District 17: Sewer Races EventLab and prevents completion on certain Difficulties.
Issue: When starting the Event on higher Difficulties you spawn too far back on the grid and on “Lap: 0”. When crossing the start line you stay stuck on Lap 0 and none of the following checkpoints register. Pro and above seems to guarantee this bug occuring but it seems Average may be the minimum for issues to potentially occur.
Solution: Lower the Difficulty to Tourist
Lowering the Difficulty to where you start near the front means the event start functions correctly and you can begin Lap 1 and register checkpoints. Novice Difficulty may fix it too but some users report issues there as well.
This is potentially an issue that could be solved by the Event Creator (Subie156) as I’m unaware if it occurs normally when playing this EventLab outside of the playlist.
Ignoring something done by the creator though hopefully the checkpoints not triggering correctly could be looked at by the Dev Team and improved for the future.
Two Reddit Posts on r/ForzaHorizon regarding this issue:
https://www.reddit.com/r/ForzaHorizon/s/2QEpLEkYrE
https://www.reddit.com/r/ForzaHorizon/s/RbMdoeKCvU
Videos:
Setting Difficulty to Pro and getting stuck on Lap 0 without being able to collect checkpoints:
Setting Difficulty to Tourist and getting the Missed Checkpoint message and reset but still being able to progress onto Lap 1 and collect checkpoints:
Tl;dr: For anyone with this issue lower the Difficulty to Tourist and you can complete the event normally.