ItemStack block fix?

ItemStack.java

public class ItemStack{
    private final Block linkedBlock;
    
    public ItemStack(Block block, ...){
        this(...);
        this.block = linkedBlock;
    }
    
    public Item getItem(){
        if (linkedBlock != null && (delegate == null || delegate.get() == null)){
            delegate = new RegistryDelegate<Item>(Item.getItemFromBlock(linkedBlock));
        }
        
        return delegate != null ? delegate.get() : null;
    }
}