-Tree leaves dont seem to render correctly
tree leaves render on the "Fast" Graphics setting for up to 2 chunks away. beyond that they render on the Fancy setting, but only their textures and act as solid blocks(they dont render the block textures that are connected to them) based on the tests i made so far.
How to:
1. Set Graphics to Fast
2. Find/place some leaves
3. walk/fly 2 chunks away in any direction including upwards and downwards

As seen in the image, the superflat world i made has the top layer set as leaves and the layers below it as wool, but the wool is not visible, instead the sky is visible