MorphMany laravel relation does not work for some reason - laravel

Question

I am using laravel 5.6 version, here is my Test model file
<?php
namespace App\Model\data\Models;
use Illuminate\database\Eloquent\Model;
class Test extends Model
{
protected $guarded = ['id'];
protected $table = 'tests';
/*
* Test - TestTranslation relation
* Test has many translations
*/
public function translations()
{
return $this->hasMany('App\Model\Data\Models\TestTranslation');
}
/*
* Test - Image relation
* Test can have an thumbnail
*/
public function thumbnails()
{
return $this->morphMany('App\Model\Data\Models\Image', 'type');
}
}
Here is my Image model
<?php
namespace App\Model\Data\Models;
use Illuminate\Database\Eloquent\Model;
class Image extends Model
{
protected $guarded = ['id'];
protected $table = 'images';
/*
* Image belongs to Post, Account, Comment
*/
public function type()
{
return $this->morphTo();
}
}
Here is my Database scheme for Images table:
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateImagesTable extends Migration
{
/**
* Run the migrations.
*
* #return void
*/
public function up()
{
Schema::create('images', function (Blueprint $table) {
$table->increments('id');
$table->string('path');
$table->enum('type', ['avatar', 'thumbnail', 'generic'])->default('generic');
$table->integer('type_id')->unsigned()->nullable();
$table->enum('type_type',[
"Account",
"Comment",
"Post",
"Skill",
"Test"
])->nullable();
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* #return void
*/
public function down()
{
Schema::dropIfExists('images');
}
}
In AppServiceProvider I linked 'Test' to my model file:
<?php
namespace App\Providers;
use Illuminate\Support\Facades\Schema;
use Illuminate\Support\ServiceProvider;
use Laravel\Dusk\DuskServiceProvider;
use Illuminate\Database\Eloquent\Relations\Relation;
use App\Model\Data\Models\Account;
use App\Model\Data\Models\EmailChangeConfirmation;
use App\Model\Observers\Common\AccountObserver;
use App\Model\Observers\Common\EmailChangeConfirmationObserver;
class AppServiceProvider extends ServiceProvider
{
/**
* Bootstrap any application services.
*
* #return void
*/
public function boot()
{
Schema::defaultStringLength(191);
Relation::morphMap([
'Account' => 'App\Model\Data\Models\Account',
'Comment' => 'App\Model\Data\Models\Comment',
'Post' => 'App\Model\Data\Models\Post',
'Skill' => 'App\Model\Data\Models\Skill',
'Test' => 'App\Model\Data\Models\Test'
]);
if(env('APP_ENV') != 'testing') {
Account::observe(AccountObserver::class);
EmailChangeConfirmation::observe(EmailChangeConfirmationObserver::class);
}
}
/**
* Register any application services.
*
* #return void
*/
public function register()
{
if ($this->app->environment('local', 'testing')) {
$this->app->register(DuskServiceProvider::class);
}
}
}
As you can see, I have more morhpMany types, and all of them works fine. But for some reason, this Test relation that I added recently always returns an empty collection, even tough I am sure that test has thumbnails. Cause:
in this screenshot, I have records in database that each test has two images. Their ID matches ids of created tests and type is "Test". I tried to clear all caches, run composer dump-autoload but none of them helped.
Maybe someone can help identify what is wrong here? Because as I said before other types as Post, Account works fine.