Sporadic functionality in Symfony 7 registration method

I have a registration method in my Symfony 7 application which is working for the most part, however certain parts seem like they aren’t being called and logging isn’t working at all.

public function register(Request $request): Response
    {
        $this->logger->critical('Testing first line of function');

        $userRegistrationDTO = new UserRegistrationDTO();
        $form                = $this->createForm(UserRegistrationType::class, $userRegistrationDTO);

        $form->handleRequest($request);

        $this->logger->critical('testing logger before form submit');

        if ($form->isSubmitted() && $form->isValid()) {
            $user = User::createUserRegistration($userRegistrationDTO);
            $this->logger->critical('test logger');

            if ($clickId = $request->cookies->get('client_id')) {
                $this->logger->critical('Creating customer with referral', ['click_id' => $clickId, 'user' => $user]);
                $this->tapAffiliateService->createCustomer($clickId, $user->email);
                $user->referralId = $clickId;
            }
            $user->referralId = 'test this is running';

            $user->password = $this->userRepository->hashPassword($user, $userRegistrationDTO->getPlainPassword());
            $this->userRepository->persist($user);
            $this->securityHelper->login($user);

            $notification = new UserRegistrationNotification($user);

            try {
                $this->notifier->notify($notification);
            } catch (\Exception $e) {
                $this->logger->critical('Failed to send registration email', ['user' => $user, 'exception' => $e]);
            }

            return $this->redirect('/app/subscribe');
        }

        $this->logger->critical('testing logger after form submit');

        return $this->render('registration/register.html.twig', [
            'registrationForm' => $form->createView(),
        ]);
    }

The template is loaded correctly and, on form submission, a user account is created, the welcome email is sent successfully and the user is logged in so it’s clear the function is running however:

• The interactions with the tapAffiliateService do not occur, even when the cookie exists.
• None of the test logs, both inside and outside of form submission, are written to the logs.
• The user is redirected to /app, not /app/subscribe.
• The test assignment $user->referralId = 'test this is running'; does not work and is not set when checking the user record.

I believe the redirection may be because of $this->securityHelper->login($user) because my security.yaml is set to redirect the user to /app on login. Am I correct in saying this?

Why would the logs not be written? I have added critical logs to a number of other controller methods and they all work fine.

This issue only occurs on my production server. I’ve tested extensively locally and it works with no issues.

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