Asserting a chain with instances when testing throws error

[gerardnll]

• Laravel Version: 8.23.1
• PHP Version: 8.0.1
• Database Driver & Version:

Description:

Although documentation specifies that passing an instance is allowed when testing, asserting a chain with object instances throws an error. Seems like it only expects strings.

TypeError: Illegal offset type in isset or empty

/app/vendor/laravel/framework/src/Illuminate/Support/Testing/Fakes/BusFake.php:382
/app/vendor/laravel/framework/src/Illuminate/Support/Testing/Fakes/BusFake.php:322
/app/vendor/laravel/framework/src/Illuminate/Support/Testing/Fakes/BusFake.php:206
/app/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php:261

Steps To Reproduce:

Create a test and assert a chain. You don't even need to add various jobs to test it.

Bus::assertChained([
    new JobOne($order)
]);