Restore vanilla entity drops behavior

Instead of just tracking the itemstacks, this tracks with it, the
action to take with that itemstack to apply the correct logic
on dropping the item instead of generalizing it for all dropped
items like CB does.

paper-server/patches/sources/net/minecraft/world/entity/boss/wither/WitherBoss.java.patch

@@ -126,6 +126,19 @@
              }
  
              this.bossEvent.setProgress(this.getHealth() / this.getMaxHealth());
+@@ -488,10 +535,10 @@
+     @Override
+     protected void dropCustomDeathLoot(ServerLevel world, DamageSource source, boolean causedByPlayer) {
+         super.dropCustomDeathLoot(world, source, causedByPlayer);
+-        ItemEntity entityitem = this.spawnAtLocation(world, (ItemLike) Items.NETHER_STAR);
++        ItemEntity entityitem = this.spawnAtLocation(world, new net.minecraft.world.item.ItemStack(Items.NETHER_STAR), 0, ItemEntity::setExtendedLifetime); // Paper - Restore vanilla drops behavior; spawnAtLocation returns null so modify the item entity with a consumer
+ 
+         if (entityitem != null) {
+-            entityitem.setExtendedLifetime();
++            entityitem.setExtendedLifetime(); // Paper - diff on change
+         }
+ 
+     }
 @@ -499,7 +546,7 @@
      @Override
      public void checkDespawn() {