Leaves X-Ray Glitch and Cloud Rendering Bug

You can look thru the world if you turn your Graphic setting to fast.
You need a Rail, A Minecart and any type of leaves.
This Glitch occures since the 1.8 Version maybe earlier...
And if you are in this glitch position, you can see, the clouds are rendering i a lower height. I think this is a bug

And sorry for my bad english i´m from germany

Here´s the Glitch:
https://youtu.be/dsivul-Z_4A