Program: 11810
Project: 11810
Buggy source:
static TridentWorld createWorld(String name,WorldLoader loader){
  TridentWorld world=null;
  try {
    TridentLogger.log("String_Node_Str" + name + "String_Node_Str");
    TridentLogger.log("String_Node_Str");
    File directory=new File(name + File.separator);
    File levelFile=new File(directory,"String_Node_Str");
    File region=new File(directory,"String_Node_Str" + File.separator);
    File playerData=new File(directory,"String_Node_Str");
    directory.mkdir();
    levelFile.createNewFile();
    region.mkdir();
    playerData.mkdir();
    world=new TridentWorld(name,loader,false);
    world.dimension=Dimension.OVERWORLD;
    world.difficulty=Difficulty.NORMAL;
    world.defaultGamemode=GameMode.SURVIVAL;
    world.type=LevelType.DEFAULT;
    world.borderSize=60000000;
    world.time=0;
    world.existed=0;
    world.raining=false;
    world.rainTime=0;
    world.thundering=false;
    world.thunderTime=0;
    world.difficultyLocked=false;
    TridentLogger.success("String_Node_Str");
    TridentLogger.log("String_Node_Str");
    int centX=((int)Math.floor(world.spawnLocation.x())) >> 4;
    int centZ=((int)Math.floor(world.spawnLocation.z())) >> 4;
    for (    ChunkLocation location : new ChunkAxisAlignedBoundingBox(ChunkLocation.create(centX - 7,centZ - 7),ChunkLocation.create(centX + 7,centZ + 7))) {
      TridentChunk chunk=new TridentChunk(world,location);
      world.addChunkAt(location,chunk);
      chunk.generate();
    }
    TridentLogger.success("String_Node_Str");
    world.spawnLocation.setX(0);
    world.spawnLocation.setY(64);
    world.spawnLocation.setZ(0);
  }
 catch (  IOException e) {
    TridentLogger.error(e);
  }
  return world;
}

Fixed version (ground truth):
static TridentWorld createWorld(String name,WorldLoader loader){
  TridentWorld world=null;
  try {
    TridentLogger.log("String_Node_Str" + name + "String_Node_Str");
    TridentLogger.log("String_Node_Str");
    File directory=new File(name + File.separator);
    File levelFile=new File(directory,"String_Node_Str");
    File region=new File(directory,"String_Node_Str" + File.separator);
    File playerData=new File(directory,"String_Node_Str");
    directory.mkdir();
    levelFile.createNewFile();
    region.mkdir();
    playerData.mkdir();
    world=new TridentWorld(name,loader,false);
    world.dimension=Dimension.OVERWORLD;
    world.difficulty=Difficulty.NORMAL;
    world.defaultGamemode=GameMode.SURVIVAL;
    world.type=LevelType.DEFAULT;
    world.borderSize=60000000;
    world.time=0;
    world.existed=0;
    world.raining=false;
    world.rainTime=0;
    world.thundering=false;
    world.thunderTime=0;
    world.difficultyLocked=false;
    TridentLogger.success("String_Node_Str");
    world.spawnLocation.setX(0);
    world.spawnLocation.setY(64);
    world.spawnLocation.setZ(0);
    TridentLogger.log("String_Node_Str");
    int centX=((int)Math.floor(world.spawnLocation.x())) >> 4;
    int centZ=((int)Math.floor(world.spawnLocation.z())) >> 4;
    for (    ChunkLocation location : new ChunkAxisAlignedBoundingBox(ChunkLocation.create(centX - 7,centZ - 7),ChunkLocation.create(centX + 7,centZ + 7))) {
      TridentChunk chunk=new TridentChunk(world,location);
      world.addChunkAt(location,chunk);
      chunk.generate();
    }
    TridentLogger.success("String_Node_Str");
  }
 catch (  IOException e) {
    TridentLogger.error(e);
  }
  return world;
}