1.9.4 Client-side | Lava to (fake) water

Hello, I am doing a troll plugin and in one of its functions I want to make all the lava look like water (without using texture packages), but that the rest of the players see how it really is, try this code:

Code (Text):

public static void b() {
   (new BukkitRunnable() {
       public void run() {
           for (Player bb : lavahide)
             try {
                 getBlocks(bb.getLocation().getBlock(), 50, bb);
                   
             } catch (Exception e) {
               }
          }
      }).runTaskTimer(plugin, 5L, 5L);
}

public static ArrayList<Block> getBlocks(Block start, int radius, Player p){
    ArrayList<Block> blocks = new ArrayList<Block>();
    for(double x = start.getLocation().getX() - radius; x <= start.getLocation().getX() + radius; x++){
      for(double y = start.getLocation().getY() - radius; y <= start.getLocation().getY() + radius; y++){
        for(double z = start.getLocation().getZ() - radius; z <= start.getLocation().getZ() + radius; z++){
          Location loc = new Location(start.getWorld(), x, y, z);
          if (loc.getBlock().getType() == Material.LAVA) {
             p.sendBlockChange(loc, Material.WATER, loc.getBlock().getData());
             }
             if (loc.getBlock().getType() == Material.STATIONARY_LAVA) {
             p.sendBlockChange(loc, Material.STATIONARY_WATER, loc.getBlock().getData());
             }
     }
     }
    }
    return blocks;
    }
 

But the problem is that the server wipes and you get to see that it is lava.

How can I solve that?
PS: Sorry for the translator, I'm from Argentina

 

I meant that the server does not respond instantly, and it is seen for an instant that it is lava

​

 

What is the event?

 

I thought about that, but I don't know much about the Protocollib

 

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I don't want to detect when a player uses a lava bucket, but I'm going to put it, this is the code

Code (Text):

    @SuppressWarnings({ "deprecation", "static-access" })
   @EventHandler
   private void onBlockPhysics(BlockPhysicsEvent e) {
       if(e.getChangedType() == Material.LAVA || e.getBlock().getType() == Material.LAVA) {
           for(Player p : plugin.tl.lavahide) {
               p.sendBlockChange(e.getBlock().getLocation(), Material.WATER, e.getBlock().getData());           }
       }
   }