Symfony version(s) affected

5.4.0-BETA2, 6.0.0-BETA2

Description

Tested beta2 with preloading and got

PHP Fatal error:  Uncaught Error: Call to a member function set() on int in var/cache/prod/App_KernelProdContainer.preload.php:13
Stack trace:
#0 config/preload.php(4): require()
#1 {main}
  thrown in var/cache/prod/App_KernelProdContainer.preload.php on line 13

It ends up including the main container class file and treating it like it returns an instance of the Container.

How to reproduce

Generate the cache with preloading. The error will be in var/cache/prod/App_KernelProdContainer.preload.php line 4.

Possible Solution

I would gladly help fix this issue, but I don't feel comfortable messing with the Dependency Injection Container.

Additional Context

No response