Why lazy loading do not work in powergrid?

I did everything according to the available documentation but lazy loading still does not work https://livewire-powergrid.com/table-component/component-configuration.html#lazy-loading i get errors: Uncaught ReferenceError: $item is not defined at [Alpine] $item (eval at safeAsyncFunction (livewire.js?id=cc800bf4:1176:21),

:3:32)Alpine Expression Error: $item is not defined

Expression: "$item"

<livewire:lazy-child key=​"bd47ef2b1fbba808b5f338c39f1043a9" :child-index=​"$item" :$this->​…​</livewire:lazy-child>​

<?php

namespace App\Livewire;

use App\Models\User;
use Illuminate\Support\Carbon;
use Illuminate\Database\Eloquent\Builder;
use PowerComponents\LivewirePowerGrid\Button;
use PowerComponents\LivewirePowerGrid\Column;
use PowerComponents\LivewirePowerGrid\Exportable;
use PowerComponents\LivewirePowerGrid\Facades\Filter;
use PowerComponents\LivewirePowerGrid\Footer;
use PowerComponents\LivewirePowerGrid\Header;
use PowerComponents\LivewirePowerGrid\PowerGrid;
use PowerComponents\LivewirePowerGrid\PowerGridFields;
use PowerComponents\LivewirePowerGrid\PowerGridComponent;
use PowerComponents\LivewirePowerGrid\Traits\WithExport;

use Illuminate\Support\Facades\Auth;

use App\Livewire\Admin\USer\UserIndex;

use App\Helpers\PermissionHelper;
use PowerComponents\LivewirePowerGrid\Facades\Rule;
use Illuminate\Support\Facades\Blade;

use PowerComponents\LivewirePowerGrid\Lazy;

final class UserTable extends PowerGridComponent
{
    use WithExport;

    public string $tableName = 'UserAdminTable';
    public $selectRowUser = 0;

    public function setUp(): array
    {
        $this->showCheckBox();

        return [
            Exportable::make('export')
                ->striped()
                ->type(Exportable::TYPE_XLS, Exportable::TYPE_CSV),
            Header::make()->showSearchInput(),
            Footer::make()
                ->showRecordCount()
                ->showRecordCount(),
            Lazy::make()
                ->rowsPerChildren(25),
        ];
    }

    public function template(): ?string
    {
        return \App\PowerGridThemes\SmallFontTheme::class;
    }

    public function datasource(): Builder
    {
        $this->showAllUser= session()->get('showAllUser');
        if ($this->showAllUser) {
            return User::query();
        } else {
            return  User::query()->where('is_active', 1);
        }
    }

    public function relationSearch(): array
    {
        return [];
    }

    public function fields(): PowerGridFields
    {
        return PowerGrid::fields()
    ->add('selectButton', function ($row) {
        return Blade::render('
        <button 
            class="btn bg-gray-300 btn-xs mx-2"
        >
            Wybierz
        </button>');
    })
 
    ->add('burger', function ($row) {
            $deleteLabel = $row->is_active == 1 ? 'Dezaktywuj' : 'Aktywuj';
            return Blade::render(
            'dropdown button code here'
            );
        })
            ->add('user_name')
            ->add('email')
            ->add('first_name')
            ->add('last_name')
            ->add('is_active', fn ($prop) => e($prop->is_active == 1 ? 'Aktywne' : 'Dezaktywowane'));
    }

    public function columns(): array
    {
        return [
            Column::make('Wybierz', 'selectButton')->bodyAttribute('sticky left-0')
            ->headerAttribute('sticky left-0 h-fit'),
            Column::make('Opcje', 'burger'),
    
            Column::make('Login', 'user_name')
                ->sortable()
                ->searchable(),
       

            Column::make('Imię', 'first_name')
                ->sortable()
                ->searchable(),

            Column::make('Nazwisko', 'last_name')
                ->sortable()
                ->searchable(),

            Column::make('Email', 'email')
                ->sortable()
                ->searchable(),
        ];
    }

    
    
    
    #[\Livewire\Attributes\On('editUser')]
    public function edit($rowId, $userName): void
    {
        $this->dispatch('editUser', [$rowId, $userName])->to(UserIndex::class);
    }

    #[\Livewire\Attributes\On('selectUser')]
    public function select($rowId): void
    {
        $this->selectRowUser = $rowId;
        $this->dispatch('selectUser', [$rowId])->to(UserIndex::class);
    }

    #[\Livewire\Attributes\On('addProfile')]
    public function addProfile($rowId, $userName, $symbol): void
    {
        $this->dispatch('addProfile', [$rowId, $userName, $symbol])->to(UserIndex::class);
    }


    
}