So weird bug happened to me while trying to beat challenger crate challenge at The flying finn track. I started it normally and beat the first two challengers. Against the third challenger however I fell two times and had to restart. After falling third time challenge failed but on screen jumped message challenge complete. When I went to check if indeed the game gave me a crate even though I really failed, to my surprise there were 10 challenger crates!! I don´t know if this bug is repeatable or if it happens in other tracks.