Rails are floating at naturally generated mineshaft

Dear mojang i was exploring caves at minectaft 1. 16.200.56 beta as exploring caves i stummpeled accross an mineshaft  i found few wierd looking floating minecart tracks i am giving the world seed and the exact cordenates on where it happened i think its an wierd worled generation bug hope you fix it soon

Seed:1433535849
Cordinates:384,32,-501
Hope this bug gets fixed soon your dear minecraft steve