[Bug]: 2 unkeyed (Model::class) datasets fail

What Happened

When I run:

use App\Models\Project;
use App\Models\User;

describe('audit logging', function () {
    it('created: event for observed model: ', function (string $modelClass) {
        /* expectations omitted, the test does not run with or without */
    })->with([
        Project::class,
        User::class,
    ]);

it should return:

✓ audit logging → it created: event for observed model: with ('App\Models\Project')
✓ audit logging → it created: event for observed model: with ('App\Models\User')

How to Reproduce

run a test with the dataset of only two model::class, you get the error below.

  ⨯ audit logging → it created: event for observed model:                                                                0.41s
  ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
   FAILED  Tests\Feature\AuditTest > `audit logging` → it created: event for observed model:                            Error
  Call to a member function connection() on null

  at vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php:2233
    2229▕      * @return \Illuminate\Database\Connection
    2230▕      */
    2231▕     public static function resolveConnection($connection = null)
    2232▕     {
  ➜ 2233▕         return static::$resolver->connection($connection);
    2234▕     }
    2235▕
    2236▕     /**
    2237▕      * Get the connection resolver instance.

If trim it to one, it succeeds,
If you add more than to it succeeds.
If you key any it will succeed, and;
If use arrays, viz ->with([[model::class], [model::class]]) it succeeds.

Sample Repository

No response

Pest Version

5.1

PHP Version

8.5.9

Operation System

macOS

Notes

No response

Reproduce the issue with a dataset containing exactly two unkeyed Model::class values, then compare it with one value, more than two, keyed values, and nested arrays. The fix is complete when both model datasets run as separate examples without the connection() on null error and produce the expected output.