Vines generate on other blocks in jungles

The bug

While I was flying around in the latest snapshot, I came across this jungle biome. I realised that there was an abnormal amount of vines on this hill so I looked around more. I found out that on a lot of blocks on hills and elevations, there were vines growing. This could be a lag problem if they grow to all the blocks around them.

How to reproduce

World Type: Buffet
World generator: Surface
Select a jungle biome