Symfony version(s) affected

6.3.*

Description

This is a close-to-absurd edge case, but still it occurred in my project so I report it.

When fetching a service from the service container that is public, non-shared, and lazy, twice (!), the following exception is thrown:

Symfony\Component\DependencyInjection\Container::get(): Return value must be of type ?object, string returned

On Symfony 6.2 or earlier versions, this exception was not thrown. It also doesn't seem to occur if the service is injected in a constructor instead of being pulled from the container.

Thank you for a look!

How to reproduce

Define a service as follows:

App\Service\SomeService:
    public: true
    shared: false
    lazy: true

Then fetch it from the service container twice:

$this->container->get(SomeService::class);
$this->container->get(SomeService::class);

Possible Solution

No response

Additional Context

The problem occurs in the container's factory method for SomeService. On the second call, $lazyLoad contains the service ID instead of the service instance.