I can't get my modded item to register and have a custom model and texture instead of the missing model block. If I reload the texture via F3 + t, it will load the model in game.  I have followed many tutorials and updated my forge to the latest version 1.12-14.21.1.2443 and I still can't get it to work. Please help me

This is the ItemInit code : 

package hunter.canadamod.init;

import hunter.canadamod.Reference;
import hunter.canadamod.init.items.MapleSyrupBottle;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.block.model.ModelResourceLocation;
import net.minecraft.item.Item;
import net.minecraftforge.client.model.ModelLoader;
import net.minecraftforge.fml.common.registry.ForgeRegistries;

public class ItemInit 
{
public static Item maple_syrup_bottle_empty;

public static void init()
{
maple_syrup_bottle_empty = new MapleSyrupBottle("maple_syrup_bottle_empty");
}

public static void register()
{
registerItem(maple_syrup_bottle_empty);
}

    
    public static void registerItem(Item item)
    {
        ForgeRegistries.ITEMS.register(item);
        
        Minecraft.getMinecraft().getRenderItem().getItemModelMesher().register(item, 0,
        new ModelResourceLocation(Reference.MODID + ":" + item.getUnlocalizedName().substring(5), "inventory"));

Thank you, I will try this later and let you know of it works. 

do i read the title correctly ??

you want to register items while the game is running ??????