It seems like there's a track missing in the "Time Attack" category? It's the 12th of the list in the game. There are mushrooms in it but I don't know the name of the track in English.

thanks for your information. i recognized it by myself as i was about to verify the run. the new game update brought 2 new tracks into the game and the mushroom cave you played was one of them. i added both new tracks, thanks for your post here. have fun grinding the WRs.