General Info

• [ x] I am running a modpack
• [ x] I can reproduce this issue consistently
  • [x ] In single player
  • In multiplayer
• [ x] I have searched for this issue previously and it was either (1) not previously reported, or (2) previously fixed and I'm having the same problem.
• I am crashing and can provide my crash report(s)
• [ x] I am using the latest version of the mod

Client Info

• Minecraft Version:
  1.12.2
• Forge Version: latest
• Mod Version: 1.7.2
• Java Version: 251 java 8

Issue Description

So if you use grimoria of gaia and nether ex and create a flatworld the world will get flooded with mimic and vase spawns. If you remove nether ex its all fine. Im not sure on which side the bug happens so i report it on both tickets. Just ignore it if you are sure its not from your side.

Create a flatworld with nether ex and gog

Reproduce Steps

Additional Information