Symfony version(s) affected

5.4.8

Description

Hi,

After upgrading to 5.4.8, I have an issue with several PHPUnit tests where multiple requests are made.
I found that the following pull request is most likely responsible for the change.

Here is an example of a failing test (last assertion fails on 5.4.8 but was valid on 5.4.7):

public function testCountUserUnreadConversations()
{
    // Not logued
    $this->client->request('GET', '/count', [], [], ['HTTP_X-Requested-With' => 'XMLHttpRequest']);
    $this->assertFalse($this->client->getResponse()->isSuccessful());
    // No Ajax
    $this->client->loginUser($this->user);
    $this->client->request('GET', '/count');
    $this->assertFalse($this->client->getResponse()->isSuccessful());
    // Ok
    $this->client->request('GET', '/count', [], [], ['HTTP_X-Requested-With' => 'XMLHttpRequest']);
    $this->assertTrue($this->client->getResponse()->isSuccessful());
}

@trsteel88 you might have some knowledge about this behavior?

How to reproduce

Here is a small reproducer.
Note: there is an EventListener which add a key/value setting in every session (currency).
Without this EventListener, there is no issue on 5.4.8, I think that's why few people might encounter the same issue and why test on Symfony repository are all green.

Possible Solution

No response

Additional Context

No response