What version of More Mystcraft are you using?
0.8.5

What version of Mystcraft are you using?
0.13.7.04

What version of Forge are you using?
14.23.5.2838

What version of Minecraft are you using?
1.12.2

What modpack and modpack version are you using, if any?
N/A

Does the bug occur server-side, client-side, or both?
Server-side

Paste a link to your log or crash report here. Use a service like pastebin. No images, please.
https://pastebin.com/PErskJMU

Describe the bug
Upon generation of an abandoned study, the game crashes. When reloading the world, there is a pile of structure blocks in the shape of an abandoned study. Maybe the conflict is with underground biomes, which replaces cobblestone, or with BoP, which replaces woods.
Shortly after discovering the crash and the structure blocks, I saw another abandoned study. This one generated properly. It is in a vanilla savanna biome, so I believe it is a BoP wood replacement conflict.

To Reproduce
Steps to reproduce the behavior:

1. Start world
2. Explore until an abandoned study generates