I noticed when exploring the whole world in creative mode. I found a cave, so I gave myself night vision flying around in the cave to see a lush cave being affected by how high the ceiling, was from being narrow to some of the parts being stretched along the way of the ravine.

To reproduce problem
Step 1 load up a world in creative mode making sure you are on the latest update.
Step 2 search around your Minecraft world until you find the Lush cave biome.
Step 3 look around the area to see if the Lush cave is rendering right.