Program: 11625
Project: 11625
Buggy source:
@Command(name="String_Node_Str",help="String_Node_Str",desc="String_Node_Str") @AllowedSourceTypes(CommandSourceType.PLAYER) @PermissionRequired("String_Node_Str") public void debug(CommandSource source,String[] args,String mode){
  TridentPlayer player=(TridentPlayer)source;
  NetClient client=player.net();
  if (mode.equals("String_Node_Str")) {
    Position playerPosition=player.getPosition();
    int chunkLoadRadius=3;
    for (int x=playerPosition.getChunkX() - chunkLoadRadius; x <= playerPosition.getChunkX() + chunkLoadRadius; x++) {
      for (int z=playerPosition.getChunkZ() - chunkLoadRadius; z <= playerPosition.getChunkZ() + chunkLoadRadius; z++) {
        TridentChunk chunk=(TridentChunk)playerPosition.getWorld().getChunkAt(x,z);
        client.sendPacket(new PlayOutChunk(chunk));
      }
    }
  }
 else   if (mode.equals("String_Node_Str")) {
    int i=0;
    for (    String word : "String_Node_Str".split("String_Node_Str")) {
      BossBar bb=BossBar.newBossBar();
      bb.setTitle(ChatComponent.text(word).setColor(ChatColor.of((char)('a' + i))));
      bb.setColor(BossBarColor.values()[i]);
      bb.setDivision(BossBarDivision.values()[i++]);
      bb.setHealth(i * .25f);
      bb.setDarkenSky(false);
      bb.setDragonBar(false);
      player.addBossBar(bb);
    }
  }
 else   if (mode.equals("String_Node_Str")) {
    Title title=Title.newTitle();
    title.setHeader(ChatComponent.create().setColor(ChatColor.AQUA).setText("String_Node_Str"));
    title.setSubtitle(ChatComponent.create().setColor(ChatColor.GOLD).setText("String_Node_Str"));
    title.setFadeIn(0);
    title.setStay(600);
    title.setFadeOut(0);
    player.sendTitle(title);
  }
 else   if (mode.equals("String_Node_Str")) {
    player.resetTitle();
  }
 else   if (mode.equals("String_Node_Str")) {
    player.sendMessage(ChatComponent.create().setText("String_Node_Str").setHoverEvent(HoverEvent.item(Item.newItem(Substance.STONE,30,(byte)1))));
  }
}

Fixed version (ground truth):
@Command(name="String_Node_Str",help="String_Node_Str",desc="String_Node_Str") @AllowedSourceTypes(CommandSourceType.PLAYER) @PermissionRequired("String_Node_Str") public void debug(CommandSource source,String[] args,String mode){
  TridentPlayer player=(TridentPlayer)source;
  NetClient client=player.net();
  if (mode.equals("String_Node_Str")) {
    Position playerPosition=player.getPosition();
    int chunkLoadRadius=3;
    for (int x=playerPosition.getChunkX() - chunkLoadRadius; x <= playerPosition.getChunkX() + chunkLoadRadius; x++) {
      for (int z=playerPosition.getChunkZ() - chunkLoadRadius; z <= playerPosition.getChunkZ() + chunkLoadRadius; z++) {
        TridentChunk chunk=(TridentChunk)playerPosition.getWorld().getChunkAt(x,z);
        client.sendPacket(new PlayOutChunk(chunk));
      }
    }
  }
 else   if (mode.equals("String_Node_Str")) {
    int i=0;
    for (    String word : "String_Node_Str".split("String_Node_Str")) {
      BossBar bb=BossBar.newBossBar();
      bb.setTitle(ChatComponent.text(word).setColor(ChatColor.of((char)('a' + i))));
      bb.setColor(BossBarColor.values()[i]);
      bb.setDivision(BossBarDivision.values()[i++]);
      bb.setHealth(i * .25f);
      bb.setDarkenSky(false);
      bb.setDragonBar(false);
      player.addBossBar(bb);
    }
  }
 else   if (mode.equals("String_Node_Str")) {
    Title title=Title.newTitle();
    title.setHeader(ChatComponent.create().setColor(ChatColor.AQUA).setText("String_Node_Str"));
    title.setSubtitle(ChatComponent.create().setColor(ChatColor.GOLD).setText("String_Node_Str"));
    title.setFadeIn(0);
    title.setStay(600);
    title.setFadeOut(0);
    player.sendTitle(title);
  }
 else   if (mode.equals("String_Node_Str")) {
    player.resetTitle();
  }
 else   if (mode.equals("String_Node_Str")) {
    player.sendMessage(ChatComponent.create().setText("String_Node_Str").setHoverEvent(HoverEvent.item(Item.newItem(Substance.STONE,30,(byte)1))));
  }
 else   if (mode.equals("String_Node_Str")) {
    player.getWorld().getWeather().beginRaining();
    player.getWorld().getWeather().beginThunder();
  }
}