Sending package to TileEntityRenderer isn't working

I was kind of following this tutorial: https://www.youtube.com/watch?v=NNclUS5edcY&t=1230s

I have a custom item saved inside my TileEntity but it only shows up on world join not when changing the Item. Here is the Code:

The update get and set have the same Code as read and write so it should be working.

This is what is not working:

@Override
	public void onDataPacket(NetworkManager net, SPacketUpdateTileEntity pkt) {
		NBTTagCompound tag = pkt.getNbtCompound();
		readUpdateTag(tag);
		this.readFromNBT(tag);
	}
	
	@Override
	public SPacketUpdateTileEntity getUpdatePacket() {
		NBTTagCompound tag = new NBTTagCompound();
		this.writeUpdateTag(tag);
		return new SPacketUpdateTileEntity(pos, getBlockMetadata(), tag);
	}
	
	@Override
	public NBTTagCompound getUpdateTag() {
		NBTTagCompound tag = super.getUpdateTag();
		writeUpdateTag(tag);
		return tag;
	}
	
	public void writeUpdateTag(NBTTagCompound tag) {
		tag.setBoolean("infusing", infusing);
		tag.setInteger("infusiontimer", infusionTimer);
		NBTTagCompound compoundItem = new NBTTagCompound();
		compoundItem = item.serializeNBT();
		tag.setTag("item", compoundItem);
	}
	
	public void readUpdateTag(NBTTagCompound tag) {
		infusing = tag.getBoolean("infusing");
		infusionTimer = tag.getInteger("infusiontimer");
		
		NBTTagCompound compoundItem = tag.getCompoundTag("item");
		item = new ItemStack(compoundItem);
	}

.

First = TileEntity. Second = renderer

package net.mysticsouls.wandustrie.tileentity;

import net.minecraft.block.state.IBlockState;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.nbt.NBTTagList;
import net.minecraft.network.NetworkManager;
import net.minecraft.network.play.server.SPacketUpdateTileEntity;
import net.minecraft.tileentity.TileEntity;

public class TileEntityManaInfuser extends TileEntity {
public ItemStack item;

boolean infusing;

int infusionTimer;

public void toggleItem(ItemStack item) {
if(world.isRemote) return;
ItemStack stack = removeItem();
if(stack != null) {
world.spawnEntity(new EntityItem(world, pos.getX(), pos.getY() + 1, pos.getZ(), stack));
}
ItemStack newItem = item.copy();
newItem.setCount(1);
setItem(newItem);

resetInfuse();

markDirty();
IBlockState state = world.getBlockState(pos);
world.notifyBlockUpdate(pos, state, state, 3);
}

ItemStack removeItem() {
ItemStack stack = this.item;
this.item = null;
return stack;
}

void setItem(ItemStack item) {
this.item = item; 
}

void resetInfuse() {
infusing = false;
infusionTimer = 0;
}

@Override
public NBTTagCompound writeToNBT(NBTTagCompound compound) {
super.writeToNBT(compound);
this.writeUpdateTag(compound);
return compound;
}

@Override
public void readFromNBT(NBTTagCompound compound) {
super.readFromNBT(compound);
this.readUpdateTag(compound);
}

@Override
public void onDataPacket(NetworkManager net, SPacketUpdateTileEntity pkt) {
NBTTagCompound tag = pkt.getNbtCompound();
readUpdateTag(tag);
this.readFromNBT(tag);
}

@Override
public SPacketUpdateTileEntity getUpdatePacket() {
NBTTagCompound tag = new NBTTagCompound();
this.writeUpdateTag(tag);
return new SPacketUpdateTileEntity(pos, getBlockMetadata(), tag);
}

@Override
public NBTTagCompound getUpdateTag() {
NBTTagCompound tag = super.getUpdateTag();
writeUpdateTag(tag);
return tag;
}

public void writeUpdateTag(NBTTagCompound tag) {
tag.setBoolean("infusing", infusing);
tag.setInteger("infusiontimer", infusionTimer);
NBTTagCompound compoundItem = new NBTTagCompound();
compoundItem = item.serializeNBT();
tag.setTag("item", compoundItem);
}

public void readUpdateTag(NBTTagCompound tag) {
infusing = tag.getBoolean("infusing");
infusionTimer = tag.getInteger("infusiontimer");

NBTTagCompound compoundItem = tag.getCompoundTag("item");
item = new ItemStack(compoundItem);
}
}

package net.mysticsouls.wandustrie.tileentity.render;

import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.client.renderer.tileentity.TileEntitySpecialRenderer;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.item.ItemStack;
import net.mysticsouls.wandustrie.init.ModItems;
import net.mysticsouls.wandustrie.tileentity.TileEntityManaInfuser;

public class RendererManaInfuser extends TileEntitySpecialRenderer<TileEntityManaInfuser>{

 private EntityItem ITEM = new EntityItem(Minecraft.getMinecraft().world, 0, 0, 0, new ItemStack(ModItems.magicOreIngot));

 @Override
 public void renderTileEntityAt(TileEntityManaInfuser te, double x, double y, double z, float partialTicks,
 int destroyStage) {
 super.renderTileEntityAt(te, x, y, z, partialTicks, destroyStage); 

 GlStateManager.pushMatrix();
 {
 if(te.item != null) {
 ITEM = new EntityItem(Minecraft.getMinecraft().world, 0, 0, 0, te.item);
 ITEM.hoverStart = 0F;
 GlStateManager.translate(x, y, z);
 GlStateManager.translate(0.5, 0, 0.5);
 GlStateManager.rotate(45F, 0, 1, 0);
 Minecraft.getMinecraft().getRenderManager().doRenderEntity(ITEM, 0, 0, 0, 0F, 0F, false);
 }
 }
 GlStateManager.popMatrix();
 }
}