Symfony version(s) affected

7.0

Description

When updating Symfony Demo to 7.0, I'm seeing this error:

An exception has been thrown during the rendering of a template:
"Callable "Symfony\Bundle\FrameworkBundle\Controller\TemplateController::templateAction()"
is not allowed as a controller.

Did you miss tagging it with "#[AsController]" or registering its type with 
"Symfony\Component\HttpKernel\Controller\ControllerResolver::allowControllers()"?"

This error doesn't happen in 6.4.

How to reproduce

Just run the Symfony Demo with 7.0. Whenever Symfony finds a TemplateController::templateAction it will show the error. For example:

https://github.com/symfony/demo/blob/206f0c9aab07cdc9f7437640b12947d35e9d5e72/templates/base.html.twig#L138-L142

https://github.com/symfony/demo/blob/206f0c9aab07cdc9f7437640b12947d35e9d5e72/config/routes.yaml#L5-L12

Possible Solution

I don't know. But this only happens in Symfony 7.0, not 6.4.

Additional Context

No response