Can't give mobs Melon Bocks or Pumpkins as a Helmet? (Works with other Blocks)

For some reason my code doesn't like Melon Blocks or Pumpkins. But Dirt works. What's wrong?

Event Class (onBlockBreak & spawn):

Code:

package me.lyndensylvester.halloween.listener;

import java.util.Random;

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.World;
import org.bukkit.block.Block;
import org.bukkit.entity.Entity;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.LivingEntity;
import org.bukkit.entity.Player;
import org.bukkit.entity.Skeleton;
import org.bukkit.entity.Zombie;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.block.BlockBreakEvent;
import org.bukkit.event.entity.EntityDeathEvent;
//import org.bukkit.event.block.BlockDropItemEvent;
//import org.bukkit.event.block.BlockDamageEvent;
//import org.bukkit.event.block.BlockGrowEvent;
import org.bukkit.event.entity.EntitySpawnEvent;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.inventory.EntityEquipment;
import org.bukkit.inventory.ItemStack;

import me.lyndensylvester.halloween.utils.Utils;
import me.lyndensylvester.halloween.Main;
import me.lyndensylvester.halloween.items.ItemManager;

public class EventListener implements Listener {

   
    private static Main plugin;
   
    @SuppressWarnings("static-access")
    public EventListener(Main plugin) {
        this.plugin = plugin;
       
        Bukkit.getPluginManager().registerEvents(this, plugin);
    }
   
    Player p;
    Block b;
    EntityType t;
   
   
    /**
    * BlockBreak event
    * 
    * Detect if the player broke a melon block
    * and send a success or failure spawn message
    * 
    * @param event
    */
    @SuppressWarnings("deprecation")
    @EventHandler
    public void onBlockBreak(BlockBreakEvent event) {
       
        p = (Player) event.getPlayer();
        b = (Block) event.getBlock();

        if (b.getType() == Material.MELON) {
            Bukkit.broadcastMessage("Inside type check skelly");
            Random rand = new Random();
            var max = 100;
            var min = 0;
            int chance = rand.nextInt(max - min + 1)  + min;
            String chances = String.valueOf(chance);

            Bukkit.broadcastMessage("Skelly chance: " + chances);
            if (chance > -1) {
                Location spawnLoc = p.getLocation().add(2,0,0);
                World world = p.getWorld();

                Bukkit.broadcastMessage("Inside chance check skelly");
                @SuppressWarnings("unused")
                Skeleton skeleton = (Skeleton) world.spawnEntity(spawnLoc, EntityType.SKELETON);
                p.sendMessage(Utils.chat(plugin.getConfig().getString("Summon_Messages.Melon_Minion.melon_succes").replace("<player>", p.getName())));
            }
            else {
                p.sendMessage(Utils.chat(plugin.getConfig().getString("Summon_Messages.Melon_Minion.melon_fail").replace("<player>", p.getName())));
            }
        }
        Bukkit.broadcastMessage("after type check skelly");
        if (b.getType() == Material.PUMPKIN) {
            Bukkit.broadcastMessage("Inside type check zombie");
            Random rand = new Random();
            var max = 100;
            var min = 0;
            int chance = rand.nextInt(max - min + 1) + min;
            String chances = String.valueOf(chance);

            Bukkit.broadcastMessage("Zombie chance: " + chances);
            if (chance > -1) {
                Location spawnLoc = p.getLocation().add(2,0,0);
                World world = p.getWorld();
                Bukkit.broadcastMessage("Inside chance check zombie");
                @SuppressWarnings("unused")
                Zombie zombie =(Zombie) world.spawnEntity(spawnLoc, EntityType.ZOMBIE);
                p.sendMessage(Utils.chat(plugin.getConfig().getString("Summon_Messages.Pumpkin_Minion.pumpkin_succes").replace("<player>", p.getName())));

            }
            else {
                p.sendMessage(Utils.chat(plugin.getConfig().getString("Summon_Messages.Pumpkin_Minion.pumpkin_fail").replace("<player>", p.getName())));
            }
        }
        Bukkit.broadcastMessage("after type check zombie");
        if (plugin.getConfig().getBoolean("Spawn_Custom_Mobs.spawn") == false) {
            p.sendMessage(Utils.chat(plugin.getConfig().getString("Spawn_Custom_Mobs.mobs")));
            Bukkit.broadcastMessage("Inside  spawn check");
        }
        Bukkit.broadcastMessage("after type checks");
    }

    /**
    * EntitySpawn event
    * 
    * Spawn a skeleton 2 blocks to the right of the player
    * 
    * @param event
    */
    @SuppressWarnings({ })
    @EventHandler
    public void spawn(EntitySpawnEvent event) {
       
            Entity entity = event.getEntity();
           
        if ((entity instanceof Skeleton) && (plugin.getConfig().getBoolean("Spawn_Custom_Mobs.spawn") == true)) {

            EntityEquipment  ee = ((Skeleton)entity).getEquipment();
            ee.setHelmet(new ItemStack(Material.MELON));
            ee.setHelmetDropChance(100);
        }
        //Bukkit.broadcastMessage("after spawn check skelly");

        if ((entity instanceof Zombie) && (plugin.getConfig().getBoolean("Spawn_Custom_Mobs.spawn") == true)) {

            EntityEquipment  ee = ((Zombie)entity).getEquipment();
            ee.setHelmet(new ItemStack(Material.DIRT));
            ee.setHelmetDropChance(100);
        }
        //Bukkit.broadcastMessage("after spawn check zombie");

       
           
    }