Vines don't update properly.

What I expected to happen was...:
When I chopped a jungle tree, the vines would disappear.

What actually happened was...:
The vines just stayed in midair.

Steps to Reproduce:
1. Chop down a naturally occurring jungle tree.
2. Wait for leaves with vines on them to decay (don't destroy them yourself)
3. Look at the floating vines.