Minecraft incorrectly generated lake - floating trees, floating grass

I generated a new world with the seed 1843298453051442537

At coords -96 62 159 (roughly)

What I expected to happen was...:
A perfectly ordinary lake would generate

What actually happened was...:
It generated, but with floating stuff over it!

Steps to Reproduce:
1. Generate a new world with the seed 1843298453051442537
2. Execute command /tp -96 62 159 (You'll be better off /tp -96 72 159)
3. Look above you with horrified face to see a grass growing out of thin air