Cave vines and mineshafts colliding can make the cave vines float

Cave vines that merge with mineshafts can sometimes have the ability for the cave vines to float.

This cane be done on any seed using the lush caves preset in single biome.

Note: any seed can have this affect as long as the cave vines are close enough to reach the mineshaft wooden base.

Steps to Reproduce:
1. Load up the seed: 12345678910 (could be any seed)

2. Set the preset to Single biome, and set the biome to lush caves.
3. Locate nearest minecraft using /locate
4. Go to x:-95 y:24 z:342