Symfony version(s) affected

≥ 3.3.7

Description

When ContainerBuilder::compile is called with $resolveEnvPlaceholders, it will end up creating a new ParameterBag from the old one:

With true as its second parameter, resolveEnvPlaceholders will start by calling the bag’s resolveValue method:

Problem is, at this point the parameter bag already has been resolved by the ResolveParameterPlaceHoldersPass, which means parameters’ value have been unescaped:

Since unescaped parameters can appear as if they contain a placeholder, those will trigger a ParameterNotFoundException.

How to reproduce

$builder = new ContainerBuilder();
$builder->setParameter('foo', '%%bar%%');
$builder->compile(true);

Symfony\Component\DependencyInjection\Exception\ParameterNotFoundException: You have requested a non-existent parameter "bar".

Possible Solution

I guess an easy fix would be to ignore ParameterNotFoundExceptions when creating the new ParameterBag? It feels like addressing a symptom rather than a cause though.

Additional Context

Spotted while investigating #59028.