The console gets spammed with biomes from BOP, it seems.

[19:46:09] [Thread-17/INFO] [STDOUT]: [atomicstryker.ruins.common.FileHandler:readPerWorldOptions:349]: Did not find Matching Biome for config string: [badlands]

I tried removing the biomes from the config as well as removing the biome files, did not fix it.

After removing the biomes from the config, you have to create a new world or replace the ruins.txts that are stored in the save folder as well as each dimension folder.