Program: 134131
Project: 134131
Buggy source:
/** 
 * Determines if a BlockSourceInformation is valid, depending on the players range from the source, and if the source has not been modified since the time that it was first created.
 * @param info the source information.
 * @param range the maximum bending range.
 * @return true if it is valid.
 */
private static boolean isStillAValidSource(BlockSourceInformation info,double range,ClickType clickType){
  if (info == null || info.getBlock() == null) {
    return false;
  }
 else   if (info.getClickType() != clickType) {
    return false;
  }
 else   if (Math.abs(info.getPlayer().getLocation().distance(info.getBlock().getLocation())) > range) {
    return false;
  }
 else   if (info.getSourceType() == BlockSourceType.WATER && !WaterMethods.isWaterbendable(info.getBlock(),info.getPlayer())) {
    return false;
  }
 else   if (info.getSourceType() == BlockSourceType.ICE && !WaterMethods.isIcebendable(info.getBlock())) {
    return false;
  }
 else   if (info.getSourceType() == BlockSourceType.PLANT && (!WaterMethods.isPlant(info.getBlock()) || !WaterMethods.isWaterbendable(info.getBlock(),info.getPlayer()))) {
    return false;
  }
 else   if (info.getSourceType() == BlockSourceType.EARTH && !EarthMethods.isEarthbendable(info.getPlayer(),info.getBlock())) {
    return false;
  }
 else   if (info.getSourceType() == BlockSourceType.METAL && (!EarthMethods.isMetal(info.getBlock()) || !EarthMethods.isEarthbendable(info.getPlayer(),info.getBlock()))) {
    return false;
  }
 else   if (info.getSourceType() == BlockSourceType.LAVA && (!EarthMethods.isLava(info.getBlock()) || !EarthMethods.isLavabendable(info.getBlock(),info.getPlayer()))) {
    return false;
  }
  return true;
}

Fixed version (ground truth):
/** 
 * Determines if a BlockSourceInformation is valid, depending on the players range from the source, and if the source has not been modified since the time that it was first created.
 * @param info the source information.
 * @param range the maximum bending range.
 * @return true if it is valid.
 */
private static boolean isStillAValidSource(BlockSourceInformation info,double range,ClickType clickType){
  if (info == null || info.getBlock() == null) {
    return false;
  }
 else   if (info.getClickType() != clickType) {
    return false;
  }
 else   if (info.getPlayer().getWorld() != info.getBlock().getWorld()) {
    return false;
  }
 else   if (Math.abs(info.getPlayer().getLocation().distance(info.getBlock().getLocation())) > range) {
    return false;
  }
 else   if (info.getSourceType() == BlockSourceType.WATER && !WaterMethods.isWaterbendable(info.getBlock(),info.getPlayer())) {
    return false;
  }
 else   if (info.getSourceType() == BlockSourceType.ICE && !WaterMethods.isIcebendable(info.getBlock())) {
    return false;
  }
 else   if (info.getSourceType() == BlockSourceType.PLANT && (!WaterMethods.isPlant(info.getBlock()) || !WaterMethods.isWaterbendable(info.getBlock(),info.getPlayer()))) {
    return false;
  }
 else   if (info.getSourceType() == BlockSourceType.EARTH && !EarthMethods.isEarthbendable(info.getPlayer(),info.getBlock())) {
    return false;
  }
 else   if (info.getSourceType() == BlockSourceType.METAL && (!EarthMethods.isMetal(info.getBlock()) || !EarthMethods.isEarthbendable(info.getPlayer(),info.getBlock()))) {
    return false;
  }
 else   if (info.getSourceType() == BlockSourceType.LAVA && (!EarthMethods.isLava(info.getBlock()) || !EarthMethods.isLavabendable(info.getBlock(),info.getPlayer()))) {
    return false;
  }
  return true;
}