Program: 147209
Project: 147209
Buggy source:
@SubscribeEvent public void onPlayerTick(TickEvent.PlayerTickEvent event){
  if (event.phase == TickEvent.Phase.START && event.side == Side.SERVER) {
    if (!event.player.capabilities.isCreativeMode) {
      for (int i=0; i < event.player.inventory.getSizeInventory(); i++) {
        ItemStack stack=event.player.inventory.getStackInSlot(i);
        if (stack != null && stack.getItem() == LoreExpansion.lorePage) {
          LoreKey key=ItemLorePage.getLore(stack);
          if (key != null) {
            Lore lore=LoreLoader.getLore(key);
            if (lore == null) {
              LoreExpansion.logger.warn("String_Node_Str");
              stack.setTagCompound(new NBTTagCompound());
              return;
            }
            LoreProperties collectedLore=PlayerHandler.getCollectedLore(event.player);
            if (!collectedLore.hasLore(key)) {
              collectedLore.addLore(key);
              PacketSyncLore.updateLore((EntityPlayerMP)event.player);
              PacketNotification.notify(event.player,PacketNotification.TYPE_CLIENT_PICKUP,key);
              LoreProperties properties=PlayerHandler.getCollectedLore(event.player);
              if (lore.autoplay && properties.canAutoplay(key)) {
                properties.setAutoplayed(key,true);
                PacketNotification.notify(event.player,PacketNotification.TYPE_CLIENT_AUTOPLAY,key);
              }
              for (              Commands.CommandEntry command : lore.commands.commands) {
                if (command.delay > 0) {
                  CommandDelayHandler.queueCommand(event.player,command);
                }
 else {
                  CommandHandler ch=(CommandHandler)MinecraftServer.getServer().getCommandManager();
                  LoreCommandSender commandSender=new LoreCommandSender(event.player);
                  ch.executeCommand(commandSender,command.command);
                }
              }
            }
            event.player.inventory.setInventorySlotContents(i,null);
            event.player.inventory.markDirty();
            return;
          }
          notifiedThisTick=false;
        }
      }
    }
  }
}

Fixed version (ground truth):
@SubscribeEvent public void onPlayerTick(TickEvent.PlayerTickEvent event){
  if (event.phase == TickEvent.Phase.START && event.side == Side.SERVER) {
    if (!event.player.capabilities.isCreativeMode) {
      for (int i=0; i < event.player.inventory.getSizeInventory(); i++) {
        ItemStack stack=event.player.inventory.getStackInSlot(i);
        if (stack != null && stack.getItem() == LoreExpansion.lorePage) {
          LoreKey key=ItemLorePage.getLore(stack);
          if (key != null) {
            Lore lore=LoreLoader.getLore(key);
            if (lore == null) {
              LoreExpansion.logger.warn("String_Node_Str");
              stack.setTagCompound(new NBTTagCompound());
              return;
            }
            LoreProperties collectedLore=PlayerHandler.getCollectedLore(event.player);
            if (!collectedLore.hasLore(key)) {
              collectedLore.addLore(key);
              PacketSyncLore.updateLore((EntityPlayerMP)event.player);
              PacketNotification.notify(event.player,PacketNotification.TYPE_CLIENT_PICKUP,key);
              LoreProperties properties=PlayerHandler.getCollectedLore(event.player);
              if (lore.autoplay && properties.canAutoplay(key)) {
                properties.setAutoplayed(key,true);
                PacketNotification.notify(event.player,PacketNotification.TYPE_CLIENT_AUTOPLAY,key);
              }
              if (lore.commands.commands != null) {
                for (                Commands.CommandEntry command : lore.commands.commands) {
                  if (command.delay > 0) {
                    CommandDelayHandler.queueCommand(event.player,command);
                  }
 else {
                    CommandHandler ch=(CommandHandler)MinecraftServer.getServer().getCommandManager();
                    LoreCommandSender commandSender=new LoreCommandSender(event.player);
                    ch.executeCommand(commandSender,command.command);
                  }
                }
              }
            }
            event.player.inventory.setInventorySlotContents(i,null);
            event.player.inventory.markDirty();
            return;
          }
          notifiedThisTick=false;
        }
      }
    }
  }
}