The Problem
If you install Biomes O' Plenty, along with a mod that increases the Nether's height like Incendium or Amplified Nether, you'll notice that if a Visceral Heap biome spawns close to the floor, some of the tendons it generates will either get cut off halfway or will get stretched out so much that some blocks aren't placed, leaving a disconnected, and broken shape.
The Fix
This mod uses a mixin to slighly change the way these features are generated and attempts to fix the above issues. While this should fix the broken tendons problem, the features stopping halfway can sometimes still happen although not enough that it's a problem.
Some settings regarding the generation of these features have been added to the mod's configs so you can also tweak them as you'd like.
I do not recommend this mod if you're not using a mod that increases the Nether height since it is unnecessary.
Modpack Use
Feel free to include this mod in your own packs. Just don’t expect full support since I don’t mod Minecraft regularly.