Facing the mb_strpos() issue

I have an MorphTo relationship. can't work function inside the morphWith
Error:
`<!--
TypeError: mb_strpos(): Argument #1 ($haystack) must be of type string, Closure given in file C:\wamp64\www\projects\archer-review-web\vendor\laravel\framework\src\Illuminate\Support\Str.php on line 197

0 C:\wamp64\www\projects\archer-review-web\vendor\laravel\framework\src\Illuminate\Support\Str.php(197): mb_strpos(Object(Closure), ':')

1 C:\wamp64\www\projects\archer-review-web\vendor\laravel\framework\src\Illuminate\Database\Eloquent\Builder.php(1364): Illuminate\Support\Str::contains(Object(Closure), ':')

2 C:\wamp64\www\projects\archer-review-web\vendor\laravel\framework\src\Illuminate\Database\Eloquent\Builder.php(1298): Illuminate\Database\Eloquent\Builder->parseWithRelations(Array)

3 C:\wamp64\www\projects\archer-review-web\vendor\laravel\framework\src\Illuminate\Database\Eloquent\Relations\MorphTo.php(141): Illuminate\Database\Eloquent\Builder->with(Array)`

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\MorphTo;

class AnnouncementSession extends Model
{
    use HasFactory;
    public $timestamps = false;
    protected $fillable = ['announcement_id', 'session_id', 'session_type'];

    public function session(): MorphTo
    {
        return $this->morphTo();
    }
}

Announcement::where('is_enabled', true)
            ->withCount('announcementProducts')
            ->with([
                'announcementSession.session' => function ($morphTo) {
                    $morphTo->morphWith([
                        TutorSchedule::class => function ($tutorSchedule) {
                            $tutorSchedule->select('id', 'tutor_id')->with(['tutor:id,first_name,last_name,profile_image,qualification']);
                        },
                    ]);
                }
               ])->get()

But below code is working fine.

Announcement::where('is_enabled', true)
            ->withCount('announcementProducts')
            ->with([
                'announcementSession.session' => function ($morphTo) {
                    $morphTo->morphWith([
                        TutorSchedule::class => ['tutor:id,first_name,last_name,profile_image,qualification'],
                    ]);
                }
            ])->get()

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