Program: 59931
Project: 59931
Buggy source:
/** 
 * Called upon block activation (right click on the block.)
 */
@Override public boolean onBlockActivated(World world,int x,int y,int z,EntityPlayer player,int par6,float par7,float par8,float par9){
  TileEntityGSGraveStone te=(TileEntityGSGraveStone)world.getTileEntity(x,y,z);
  if (te != null) {
    if (player.inventory.getCurrentItem() != null) {
      ItemStack item=player.inventory.getCurrentItem();
      if (item.getItem() instanceof ItemSpade) {
        if (!world.isRemote) {
          GraveStoneLogger.logInfo(player.getCommandSenderName() + "String_Node_Str" + x+ "String_Node_Str"+ y+ "String_Node_Str"+ z);
          te.dropAllItems();
        }
        return false;
      }
 else {
        if (te.hasFlower()) {
          if (item.getItem() instanceof ItemShears) {
            if (!world.isRemote) {
              te.dropFlower();
            }
            te.setFlower(null);
            return false;
          }
        }
 else {
          if (GraveStoneHelper.FLOWERS.contains(Block.getBlockFromItem(item.getItem())) && GraveStoneHelper.FLOWERS_GROUND.contains(world.getBlock(x,y - 1,z)) && GraveStoneHelper.canFlowerBePlaced(te)) {
            te.setFlower(new ItemStack(item.getItem(),1,item.getItemDamage()));
            if (world.isRemote) {
              player.inventory.getCurrentItem().stackSize--;
            }
            return true;
          }
        }
      }
    }
    if (world.isRemote) {
      String name;
      String deathText;
      String killerName;
      deathText=te.getDeathTextComponent().getDeathText();
      if (deathText.length() != 0) {
        if (te.getDeathTextComponent().isLocalized()) {
          name=te.getDeathTextComponent().getName();
          killerName=ModGraveStone.proxy.getLocalizedEntityName(te.getDeathTextComponent().getKillerName());
          if (killerName.length() == 0) {
            player.addChatComponentMessage(new ChatComponentTranslation(deathText,new Object[]{name}));
          }
 else {
            player.addChatComponentMessage(new ChatComponentTranslation(deathText,new Object[]{name,killerName}));
          }
        }
 else {
          player.addChatComponentMessage(new ChatComponentTranslation(deathText));
        }
        if (te.getAge() != -1) {
          player.addChatComponentMessage(new ChatComponentTranslation("String_Node_Str" + te.getAge() + "String_Node_Str"));
        }
      }
    }
  }
  return false;
}

Fixed version (ground truth):
/** 
 * Called upon block activation (right click on the block.)
 */
@Override public boolean onBlockActivated(World world,int x,int y,int z,EntityPlayer player,int par6,float par7,float par8,float par9){
  TileEntityGSGraveStone te=(TileEntityGSGraveStone)world.getTileEntity(x,y,z);
  if (te != null) {
    if (player.inventory.getCurrentItem() != null) {
      ItemStack item=player.inventory.getCurrentItem();
      if (item.getItem() instanceof ItemSpade) {
        if (!world.isRemote) {
          GraveStoneLogger.logInfo(player.getCommandSenderName() + "String_Node_Str" + x+ "String_Node_Str"+ y+ "String_Node_Str"+ z);
          te.dropAllItems();
        }
        return false;
      }
 else {
        if (te.hasFlower()) {
          if (item.getItem() instanceof ItemShears) {
            if (!world.isRemote) {
              te.dropFlower();
            }
            te.setFlower(null);
            return false;
          }
        }
 else {
          if (GraveStoneHelper.FLOWERS.contains(Block.getBlockFromItem(item.getItem())) && GraveStoneHelper.FLOWERS_GROUND.contains(world.getBlock(x,y - 1,z)) && GraveStoneHelper.canFlowerBePlaced(te)) {
            te.setFlower(new ItemStack(item.getItem(),1,item.getItemDamage()));
            if (world.isRemote) {
              player.inventory.getCurrentItem().stackSize--;
            }
            return true;
          }
        }
      }
    }
    if (world.isRemote) {
      String name;
      String deathText;
      String killerName;
      deathText=te.getDeathTextComponent().getDeathText();
      if (deathText.length() != 0) {
        if (te.getDeathTextComponent().isLocalized()) {
          name=te.getDeathTextComponent().getName();
          killerName=ModGraveStone.proxy.getLocalizedEntityName(te.getDeathTextComponent().getKillerName());
          if (killerName.length() == 0) {
            player.addChatComponentMessage(new ChatComponentTranslation(deathText,new Object[]{name}));
          }
 else {
            player.addChatComponentMessage(new ChatComponentTranslation(deathText,new Object[]{name,killerName}));
          }
        }
 else {
          player.addChatComponentMessage(new ChatComponentTranslation(deathText));
        }
        if (te.getAge() != -1) {
          StringBuilder ageStr=new StringBuilder();
          ageStr.append(ModGraveStone.proxy.getLocalizedString("String_Node_Str")).append("String_Node_Str").append(te.getAge()).append("String_Node_Str").append(ModGraveStone.proxy.getLocalizedString("String_Node_Str"));
          player.addChatComponentMessage(new ChatComponentTranslation(ageStr.toString()));
        }
      }
    }
  }
  return false;
}