Custom attribute cast, error with Illuminate\Http\UploadedFile

[izica]

• Laravel Version: 8.4.0
• PHP Version: 8.0
• Database Driver & Version: mysql:8.0.19

Description:

When Illuminate\Http\UploadedFile passed in custom cast as value, setter called multiple times,
and after last call, attribute value is empty object, but value is valid in database record.

If argument isn't Illuminate\Http\UploadedFile everything is ok.

Steps To Reproduce:

<?php

namespace App\Casts;

use Illuminate\Contracts\Database\Eloquent\CastsAttributes;
use Illuminate\Http\UploadedFile;
use Illuminate\Support\Facades\Storage;

class File implements CastsAttributes
{
    public function get($model, $key, $value, $attributes)
    {
        if (Storage::disk('files')->has($value)) {
            return Storage::disk('files')->url($value);
        }

        return $value;
    }

    public function set($model, $key, $value, $attributes)
    {
        if ($value instanceof UploadedFile) {
            $filename = uniqid('', false) . time() . '.' . $value->getClientOriginalExtension();
            return Storage::disk('files')->putFileAs($model->getTable(), $value, $filename) ?: null;
        }

        return $value;
    }
}

<?php

namespace App\Http\Controllers\Api\V1;

use App\Models\News;
use App\Http\Controllers\Api\Controller;
use Illuminate\Http\Request;

class TestController extends Controller
{
    public function upload(Request $request)
    {
        $request->validate([
            'file' => 'required',
        ]);

        $news = News::first();
        $news->preview_image_url = $request->file('file');
        $news->save();
    }
}

If argument is Illuminate\Http\UploadedFile setter calls 8 times and return attribute value is empty object.
If argument isn't Illuminate\Http\UploadedFile setter called one time and return attribute value is valid.