Program: 79935
Project: 79935
Buggy source:
public AReactor(Category category,ItemStack item,String id,RecipeType recipeType,ItemStack[] recipe){
  super(category,item,id,recipeType,recipe);
  new BlockMenuPreset(id,getInventoryTitle()){
    @Override public void init(){
      constructMenu(this);
    }
    @Override public void newInstance(    final BlockMenu menu,    final Block b){
      try {
        if (BlockStorage.getBlockInfo(b,"String_Node_Str") == null) {
          BlockStorage.addBlockInfo(b,"String_Node_Str","String_Node_Str");
        }
        if (!BlockStorage.hasBlockInfo(b) || BlockStorage.getBlockInfo(b,"String_Node_Str").equals("String_Node_Str")) {
          menu.replaceExistingItem(4,new CustomItem(CustomSkull.getItem("String_Node_Str"),"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
          menu.addMenuClickHandler(4,new MenuClickHandler(){
            @Override public boolean onClick(            Player p,            int arg1,            ItemStack arg2,            ClickAction arg3){
              BlockStorage.addBlockInfo(b,"String_Node_Str","String_Node_Str");
              newInstance(menu,b);
              return false;
            }
          }
);
        }
 else {
          menu.replaceExistingItem(4,new CustomItem(SlimefunItems.PLUTONIUM,"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
          menu.addMenuClickHandler(4,new MenuClickHandler(){
            @Override public boolean onClick(            Player p,            int arg1,            ItemStack arg2,            ClickAction arg3){
              BlockStorage.addBlockInfo(b,"String_Node_Str","String_Node_Str");
              newInstance(menu,b);
              return false;
            }
          }
);
        }
      }
 catch (      Exception x) {
      }
    }
    @Override public boolean canOpen(    Block b,    Player p){
      return p.hasPermission("String_Node_Str") || CSCoreLib.getLib().getProtectionManager().canAccessChest(p.getUniqueId(),b,true);
    }
    @Override public int[] getSlotsAccessedByItemTransport(    ItemTransportFlow flow){
      return new int[0];
    }
  }
;
  registerBlockHandler(id,new SlimefunBlockHandler(){
    @Override public void onPlace(    Player p,    Block b,    SlimefunItem item){
    }
    @Override public boolean onBreak(    Player p,    Block b,    SlimefunItem item,    UnregisterReason reason){
      BlockMenu inv=BlockStorage.getInventory(b);
      if (inv != null) {
        for (        int slot : getFuelSlots()) {
          if (inv.getItemInSlot(slot) != null)           b.getWorld().dropItemNaturally(b.getLocation(),inv.getItemInSlot(slot));
        }
        for (        int slot : getCoolantSlots()) {
          if (inv.getItemInSlot(slot) != null)           b.getWorld().dropItemNaturally(b.getLocation(),inv.getItemInSlot(slot));
        }
        for (        int slot : getOutputSlots()) {
          if (inv.getItemInSlot(slot) != null)           b.getWorld().dropItemNaturally(b.getLocation(),inv.getItemInSlot(slot));
        }
      }
      progress.remove(b.getLocation());
      processing.remove(b.getLocation());
      ReactorHologram.remove(b.getLocation());
      return true;
    }
  }
);
  this.registerDefaultRecipes();
}

Fixed version (ground truth):
public AReactor(Category category,ItemStack item,String id,RecipeType recipeType,ItemStack[] recipe){
  super(category,item,id,recipeType,recipe);
  new BlockMenuPreset(id,getInventoryTitle()){
    @Override public void init(){
      constructMenu(this);
    }
    @Override public void newInstance(    final BlockMenu menu,    final Block b){
      try {
        if (BlockStorage.getBlockInfo(b,"String_Node_Str") == null) {
          BlockStorage.addBlockInfo(b,"String_Node_Str","String_Node_Str");
        }
        if (!BlockStorage.hasBlockInfo(b) || BlockStorage.getBlockInfo(b,"String_Node_Str").equals("String_Node_Str")) {
          menu.replaceExistingItem(4,new CustomItem(CustomSkull.getItem("String_Node_Str"),"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
          menu.addMenuClickHandler(4,new MenuClickHandler(){
            @Override public boolean onClick(            Player p,            int arg1,            ItemStack arg2,            ClickAction arg3){
              BlockStorage.addBlockInfo(b,"String_Node_Str","String_Node_Str");
              newInstance(menu,b);
              return false;
            }
          }
);
        }
 else {
          menu.replaceExistingItem(4,new CustomItem(SlimefunItems.PLUTONIUM,"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"));
          menu.addMenuClickHandler(4,new MenuClickHandler(){
            @Override public boolean onClick(            Player p,            int arg1,            ItemStack arg2,            ClickAction arg3){
              BlockStorage.addBlockInfo(b,"String_Node_Str","String_Node_Str");
              newInstance(menu,b);
              return false;
            }
          }
);
        }
      }
 catch (      Exception x) {
      }
    }
    @Override public boolean canOpen(    Block b,    Player p){
      return p.hasPermission("String_Node_Str") || CSCoreLib.getLib().getProtectionManager().canAccessChest(p.getUniqueId(),b,true);
    }
    @Override public int[] getSlotsAccessedByItemTransport(    ItemTransportFlow flow){
      return new int[0];
    }
  }
;
  registerBlockHandler(id,new SlimefunBlockHandler(){
    @Override public void onPlace(    Player p,    Block b,    SlimefunItem item){
    }
    @Override public boolean onBreak(    Player p,    Block b,    SlimefunItem item,    UnregisterReason reason){
      BlockMenu inv=BlockStorage.getInventory(b);
      if (inv != null) {
        for (        int slot : getFuelSlots()) {
          if (inv.getItemInSlot(slot) != null) {
            b.getWorld().dropItemNaturally(b.getLocation(),inv.getItemInSlot(slot));
            inv.replaceExistingItem(slot,null);
          }
        }
        for (        int slot : getCoolantSlots()) {
          if (inv.getItemInSlot(slot) != null) {
            b.getWorld().dropItemNaturally(b.getLocation(),inv.getItemInSlot(slot));
            inv.replaceExistingItem(slot,null);
          }
        }
        for (        int slot : getOutputSlots()) {
          if (inv.getItemInSlot(slot) != null) {
            b.getWorld().dropItemNaturally(b.getLocation(),inv.getItemInSlot(slot));
            inv.replaceExistingItem(slot,null);
          }
        }
      }
      progress.remove(b.getLocation());
      processing.remove(b.getLocation());
      ReactorHologram.remove(b.getLocation());
      return true;
    }
  }
);
  this.registerDefaultRecipes();
}