Program: 86727
Project: 86727
Buggy source:
public void applyGameUpdate(GameUpdateMessage msg){
  NetGameUpdate netUpdate=msg.netUpdate;
  gameClock=netUpdate.time;
  if (netUpdate.entities != null) {
    int size=netUpdate.entities.length;
    for (int i=0; i < size; i++) {
      NetEntity netEnt=netUpdate.entities[i];
      if (netEnt != null) {
        if (entities.containsEntity(netEnt.id)) {
          ClientEntity ent=entities.getEntity(netEnt.id);
          if (Type.fromNet(netEnt.type) == ent.getType()) {
            ent.updateState(netEnt,gameClock);
          }
 else {
            removeEntity(i);
            createEntity(netEnt);
          }
        }
 else {
          createEntity(netEnt);
        }
      }
 else {
        if (i < SeventhConstants.MAX_PERSISTANT_ENTITIES) {
          if (netUpdate.deadPersistantEntities.getBit(i)) {
            removeEntity(i);
          }
        }
 else {
          removeEntity(i);
        }
      }
    }
  }
  if (netUpdate.sounds != null) {
    int size=netUpdate.numberOfSounds;
    for (int i=0; i < size; i++) {
      NetSound snd=netUpdate.sounds[i];
      if (snd != null) {
        Sounds.playSound(snd,snd.posX,snd.posY);
      }
    }
  }
  if (netUpdate.spectatingPlayerId > -1 && !cameraController.isCameraRoaming()) {
    int previousSpec=localPlayer.getSpectatingPlayerId();
    localPlayer.setSpectatingPlayerId(netUpdate.spectatingPlayerId);
    if (previousSpec != netUpdate.spectatingPlayerId) {
      ClientEntity ent=this.entities.getEntity(netUpdate.spectatingPlayerId);
      if (ent != null) {
        camera.centerAroundNow(ent.getCenterPos());
      }
    }
  }
 else {
    localPlayer.setSpectatingPlayerId(Entity.INVALID_ENTITY_ID);
  }
}

Fixed version (ground truth):
public void applyGameUpdate(GameUpdateMessage msg){
  NetGameUpdate netUpdate=msg.netUpdate;
  gameClock=netUpdate.time;
  if (netUpdate.entities != null) {
    int size=netUpdate.entities.length;
    for (int i=0; i < size; i++) {
      NetEntity netEnt=netUpdate.entities[i];
      if (netEnt != null) {
        if (entities.containsEntity(netEnt.id)) {
          ClientEntity ent=entities.getEntity(netEnt.id);
          if (Type.fromNet(netEnt.type) == ent.getType()) {
            ent.updateState(netEnt,gameClock);
          }
 else {
            removeEntity(i);
            createEntity(netEnt);
          }
        }
 else {
          createEntity(netEnt);
        }
      }
 else {
        if (i < SeventhConstants.MAX_PERSISTANT_ENTITIES) {
          if (netUpdate.deadPersistantEntities.getBit(i)) {
            removeEntity(i);
          }
        }
 else {
          removeEntity(i);
        }
      }
    }
  }
  if (netUpdate.sounds != null) {
    int size=netUpdate.numberOfSounds;
    for (int i=0; i < size; i++) {
      NetSound snd=netUpdate.sounds[i];
      if (snd != null) {
switch (snd.getSoundType().getSourceType()) {
case POSITIONAL:
{
            Sounds.playSound(snd,snd.posX,snd.posY);
            break;
          }
case REFERENCED:
{
          NetSoundByEntity soundByEntity=(NetSoundByEntity)snd;
          if (soundByEntity.hasPositionalInformation()) {
            Sounds.playSound(snd,snd.posX,snd.posY);
          }
 else {
            ClientEntity entity=this.entities.getEntity(soundByEntity.entityId);
            if (entity != null) {
              Vector2f pos=entity.getCenterPos();
              if (entity.getId() == this.localPlayer.getViewingEntityId()) {
switch (snd.getSoundType()) {
case SURFACE_DIRT:
case SURFACE_GRASS:
case SURFACE_METAL:
case SURFACE_NORMAL:
case SURFACE_SAND:
case SURFACE_WATER:
case SURFACE_WOOD:
                  Sounds.playSound(snd,pos.x,pos.y,0.35f);
                break;
default :
              Sounds.playSound(snd,pos.x,pos.y);
          }
        }
 else {
          Sounds.playSound(snd,pos.x,pos.y);
        }
      }
    }
    break;
  }
case REFERENCED_ATTACHED:
{
  NetSoundByEntity soundByEntity=(NetSoundByEntity)snd;
  if (soundByEntity.hasPositionalInformation()) {
    Sounds.playSound(snd,snd.posX,snd.posY);
  }
 else {
    ClientEntity entity=this.entities.getEntity(soundByEntity.entityId);
    if (entity != null) {
      Vector2f pos=entity.getCenterPos();
      entity.attachSound(Sounds.playSound(snd,pos.x,pos.y));
    }
  }
  break;
}
case GLOBAL:
Sounds.playGlobalSound(snd);
break;
}
}
}
}
if (netUpdate.spectatingPlayerId > -1 && !cameraController.isCameraRoaming()) {
int previousSpec=localPlayer.getSpectatingPlayerId();
localPlayer.setSpectatingPlayerId(netUpdate.spectatingPlayerId);
if (previousSpec != netUpdate.spectatingPlayerId) {
ClientEntity ent=this.entities.getEntity(netUpdate.spectatingPlayerId);
if (ent != null) {
camera.centerAroundNow(ent.getCenterPos());
}
}
}
 else {
localPlayer.setSpectatingPlayerId(Entity.INVALID_ENTITY_ID);
}
}