Program: 34854
Project: 34854
Buggy source:
@Override public boolean onBlockStartBreak(ItemStack stack,int x,int y,int z,EntityPlayer player){
  if (getEnergyStored(stack) <= player.worldObj.getBlock(x,y,z).getBlockHardness(player.worldObj,x,y,z) * ConfigurationHandler.powerDifficultyModifiers[player.worldObj.difficultySetting.getDifficultyId()] * ConfigurationHandler.basePowerModifier) {
    player.addChatComponentMessage(new ChatComponentTranslation("String_Node_Str"));
    return true;
  }
  if (!player.isSneaking() && isUpgradeInstalled(stack,"String_Node_Str")) {
    int range=1;
    Block block=player.worldObj.getBlock(x,y,z);
    if (block.getBlockHardness(player.worldObj,x,y,z) == 0)     return false;
    if (getEfficiency(stack,block) > 1) {
      MovingObjectPosition mop=getMovingObjectPositionFromPlayer(player.worldObj,player,true);
      if (mop == null)       return false;
switch (ForgeDirection.getOrientation(mop.sideHit)) {
case UP:
case DOWN:
        for (int xx=x - range; xx <= x + range; xx++) {
          for (int zz=z - range; zz <= z + range; zz++) {
            if (xx == x && zz == z)             continue;
            block=player.worldObj.getBlock(xx,y,zz);
            if (isToolEffective(stack,block,player.worldObj.getBlockMetadata(xx,y,zz)) && getEfficiency(stack,block) > 1 && onBlockDestroyed(stack,player.worldObj,block,xx,y,zz,player))             if (canHarvestBlock(block,player.getCurrentEquippedItem()))             Utils.harvestBlock(player.worldObj,xx,y,zz,player);
          }
        }
      break;
case NORTH:
case SOUTH:
    for (int xx=x - range; xx <= x + range; xx++) {
      for (int yy=y - range; yy <= y + range; yy++) {
        if (xx == x && yy == y)         continue;
        block=player.worldObj.getBlock(xx,yy,z);
        if (isToolEffective(stack,block,player.worldObj.getBlockMetadata(xx,yy,z)) && getEfficiency(stack,block) > 1 && onBlockDestroyed(stack,player.worldObj,block,xx,yy,z,player))         if (canHarvestBlock(block,player.getCurrentEquippedItem()))         Utils.harvestBlock(player.worldObj,xx,yy,z,player);
      }
    }
  break;
case WEST:
case EAST:
for (int yy=y - range; yy <= y + range; yy++) {
  for (int zz=z - range; zz <= z + range; zz++) {
    if (yy == y && zz == z)     continue;
    block=player.worldObj.getBlock(x,yy,zz);
    if (isToolEffective(stack,block,player.worldObj.getBlockMetadata(x,yy,zz)) && getEfficiency(stack,block) > 1 && onBlockDestroyed(stack,player.worldObj,block,x,yy,zz,player))     if (canHarvestBlock(block,player.getCurrentEquippedItem()))     Utils.harvestBlock(player.worldObj,x,yy,zz,player);
  }
}
break;
}
}
}
return false;
}

Fixed version (ground truth):
@Override public boolean onBlockStartBreak(ItemStack stack,int x,int y,int z,EntityPlayer player){
  if (getEnergyStored(stack) <= player.worldObj.getBlock(x,y,z).getBlockHardness(player.worldObj,x,y,z) * ConfigurationHandler.powerDifficultyModifiers[player.worldObj.difficultySetting.getDifficultyId()] * ConfigurationHandler.basePowerModifier) {
    if (!player.worldObj.isRemote)     player.addChatComponentMessage(new ChatComponentTranslation("String_Node_Str"));
    return true;
  }
  if (!player.isSneaking() && isUpgradeInstalled(stack,"String_Node_Str")) {
    int range=1;
    Block block=player.worldObj.getBlock(x,y,z);
    if (block.getBlockHardness(player.worldObj,x,y,z) == 0)     return false;
    if (getEfficiency(stack,block) > 1) {
      MovingObjectPosition mop=getMovingObjectPositionFromPlayer(player.worldObj,player,true);
      if (mop == null)       return false;
switch (ForgeDirection.getOrientation(mop.sideHit)) {
case UP:
case DOWN:
        for (int xx=x - range; xx <= x + range; xx++) {
          for (int zz=z - range; zz <= z + range; zz++) {
            if (xx == x && zz == z)             continue;
            block=player.worldObj.getBlock(xx,y,zz);
            if (isToolEffective(stack,block,player.worldObj.getBlockMetadata(xx,y,zz)) && getEfficiency(stack,block) > 1 && onBlockDestroyed(stack,player.worldObj,block,xx,y,zz,player))             if (canHarvestBlock(block,player.getCurrentEquippedItem()))             Utils.harvestBlock(player.worldObj,xx,y,zz,player);
          }
        }
      break;
case NORTH:
case SOUTH:
    for (int xx=x - range; xx <= x + range; xx++) {
      for (int yy=y - range; yy <= y + range; yy++) {
        if (xx == x && yy == y)         continue;
        block=player.worldObj.getBlock(xx,yy,z);
        if (isToolEffective(stack,block,player.worldObj.getBlockMetadata(xx,yy,z)) && getEfficiency(stack,block) > 1 && onBlockDestroyed(stack,player.worldObj,block,xx,yy,z,player))         if (canHarvestBlock(block,player.getCurrentEquippedItem()))         Utils.harvestBlock(player.worldObj,xx,yy,z,player);
      }
    }
  break;
case WEST:
case EAST:
for (int yy=y - range; yy <= y + range; yy++) {
  for (int zz=z - range; zz <= z + range; zz++) {
    if (yy == y && zz == z)     continue;
    block=player.worldObj.getBlock(x,yy,zz);
    if (isToolEffective(stack,block,player.worldObj.getBlockMetadata(x,yy,zz)) && getEfficiency(stack,block) > 1 && onBlockDestroyed(stack,player.worldObj,block,x,yy,zz,player))     if (canHarvestBlock(block,player.getCurrentEquippedItem()))     Utils.harvestBlock(player.worldObj,x,yy,zz,player);
  }
}
break;
}
}
}
return false;
}