Error when used with flex and no symfony/symfony package

[beberlei]

> post-update-cmd: @auto-scripts
> auto-scripts: Symfony\Flex\Flex_composer_tmp1->executeAutoScripts
Executing script cache:clear
Executed script cache:clear  [KO]
 [KO]
Script cache:clear returned with error code 1
!!  
!!  In InstalledVersions.php line 1218:
!!                                                
!!    Package "symfony/symfony" is not installed  
!!                                                
!!  
!!  
Script @auto-scripts was called via post-update-cmd

Installation failed, reverting ./composer.json and ./composer.lock to their original content.