Program: 11893
Project: 11893
Buggy source:
public void load(CompoundTag tag){
  TridentLogger logger=Trident.getLogger();
  logger.info("String_Node_Str");
  IntTag x=tag.getTagAs("String_Node_Str");
  IntTag z=tag.getTagAs("String_Node_Str");
  LongTag lastModifed=tag.getTagAs("String_Node_Str");
  ByteTag lightPopulated=tag.getTagAs("String_Node_Str");
  ByteTag terrainPopulated=tag.getTagAs("String_Node_Str");
  LongTag inhabitedTime=tag.getTagAs("String_Node_Str");
  ByteArrayTag biomes=tag.getTagAs("String_Node_Str");
  ListTag sections=tag.getTagAs("String_Node_Str");
  ListTag entities=tag.getTagAs("String_Node_Str");
  ListTag tileEntities=tag.getTagAs("String_Node_Str");
  ListTag tileTicks=tag.getTagAs("String_Node_Str");
  logger.info("String_Node_Str");
  logger.info("String_Node_Str");
  List<NBTTag> sectionsList=sections.listTags();
  this.sections=new ChunkSection[sectionsList.size()];
  for (int i=0; i <= sectionsList.size(); i+=1) {
    NBTTag t=sections.getTag(i);
    if (t instanceof CompoundTag) {
      CompoundTag ct=(CompoundTag)t;
      this.sections[i]=NBTSerializer.deserialize(ChunkSection.class,ct);
      this.sections[i].loadBlocks();
    }
  }
  logger.info("String_Node_Str");
  FastClass entityClass=FastClass.get(TridentEntity.class);
  for (  NBTTag t : entities.listTags()) {
    TridentEntity entity=entityClass.getConstructor().newInstance();
    entity.load((CompoundTag)t);
    this.entities.add(entity);
  }
  logger.info("String_Node_Str");
  this.lightPopulated=lightPopulated.getValue();
  this.terrainPopulated=terrainPopulated.getValue();
  this.lastModified=lastModifed.getValue();
  this.inhabitedTime=inhabitedTime.getValue();
  logger.info("String_Node_Str");
}

Fixed version (ground truth):
public void load(CompoundTag root){
  CompoundTag tag=root.getTagAs("String_Node_Str");
  LongTag lastModifed=tag.getTagAs("String_Node_Str");
  ByteTag lightPopulated=tag.getTagAs("String_Node_Str");
  ByteTag terrainPopulated=tag.getTagAs("String_Node_Str");
  LongTag inhabitedTime=tag.getTagAs("String_Node_Str");
  IntArrayTag biomes=tag.getTagAs("String_Node_Str");
  ListTag sections=tag.getTagAs("String_Node_Str");
  ListTag entities=tag.getTagAs("String_Node_Str");
  ListTag tileEntities=tag.getTagAs("String_Node_Str");
  ListTag tileTicks=(root.containsTag("String_Node_Str")) ? (ListTag)tag.getTag("String_Node_Str") : new ListTag("String_Node_Str",TagType.COMPOUND);
  List<NBTTag> sectionsList=sections.listTags();
  this.sections=new ChunkSection[sectionsList.size()];
  for (int i=0; i < sectionsList.size(); i+=1) {
    NBTTag t=sections.getTag(i);
    if (t instanceof CompoundTag) {
      CompoundTag ct=(CompoundTag)t;
      this.sections[i]=NBTSerializer.deserialize(ChunkSection.class,ct);
      this.sections[i].loadBlocks(getWorld());
    }
  }
  FastClass entityClass=FastClass.get(TridentEntity.class);
  for (  NBTTag t : entities.listTags()) {
    TridentEntity entity=entityClass.getConstructor().newInstance();
    entity.load((CompoundTag)t);
    this.entities.add(entity);
  }
  this.lightPopulated=lightPopulated.getValue();
  this.terrainPopulated=terrainPopulated.getValue();
  this.lastModified=lastModifed.getValue();
  this.inhabitedTime=inhabitedTime.getValue();
}