on Pine Valley track 2 around the waterfall area you can be randomly pushed off the track and into the waterfall, where you can’t move forward or back and are essentially stuck there.
pic related: happened during the 3rd lap, the other player was far ahead so he didn’t push me, i was close to the edge when it occurred. if i could recommend a fix, i would suggest making it so you get automatically pushed down to the river below so you don’t get automatically stuck if you fall.
sorry i can’t provide any other information to help with replicating this glitch, it happened so fast that i wasn’t able to access what exactly had happened.