Symfony version(s) affected: 5.0.*
php: 7.4.*

Description
If you enable in php.ini configuration preloading for prod environment,
opcache.preload=/app/var/cache/prod/App_Infrastructure_KernelProdContainer.preload.php opcache.preload_user=www-data
you will see the next error during composer update command:

Fatal error: Uncaught Error: Class 'Symfony\Component\Console\Terminal' not found in /app/vendor/symfony/console/Application.php:84
Stack trace:
#0 phar:///usr/local/bin/composer/src/Composer/Console/Application.php(101): Symfony\Component\Console\Application->__construct('Composer', '1.10.7')
#1 phar:///usr/local/bin/composer/bin/composer(60): Composer\Console\Application->__construct()
#2 /usr/local/bin/composer(24): require('phar:///usr/loc...')
#3 {main}
  thrown in /app/vendor/symfony/console/Application.php on line 84

This error not reproduced for other environments.
If you will add Class 'Symfony\Component\Console\Terminal' to ...preload.php file, you will see another error.
I guess something wrong with ...preload.php file.

How to reproduce
I created simple project that contain only symfony code, with instruction how to reproduce it https://github.com/Nidhognit/symfony-error-example
You need to have docker-compose for it.

Additional context
Probably, this is composer error, but it happen only with symfony preload file and only for prod environment