Transaction does not rollback when exception occurs outside controller – Laravel

Transaction does not rollback when exception occurs outside controller

The methods used inside the register function are implemented in a trait, and all side methods throw an exception in case of an error.
But unfortunately, when an exception is thrown inside one of the side methods outside controller (for example: findRefererIdFromRequest() or findRefererIdFromRequest() or collectDataFromRequest()), the database return operation does not happen And the new user that was created by the create method is still inside the database and cannot be rolled back

class RegisterController extends Controller
{
    use AuthenticationTrait;

    public function register(RegisterRequest $request)
    {

        DB::beginTransaction();

        try {

            # Collect data from request
            $dataCollect = $this->collectDataFromRequest($request);

            # Create a new user
            $this->createUser($dataCollect);

            # Find ReferrerID from the request by invitation code
            $referrerId = $this->findRefererIdFromRequest($request);

            # Put ReferrerId into the user profile
            $this->putReferrerId($referrerId);

            DB::commit();

            # Return success response
            return response()->json($this->registerSuccessResponse());
        } catch (Exception $ex) {
            DB::rollBack();
            return response()->json(['status' => false, 'message' => $ex->getMessage()], 422);
        }
    }
}

trait AuthenticationTrait
{

    protected function collectDataFromRequest($request)
    {
        try {
            return collect($request->only([
                'name', 'email', 'password', 'country_id', 'language_id'
            ]));
        } catch (Throwable $th) {
            throw new CustomException(__("The system is unable to collect input data."));
        }
    }



    protected function createUser($dataCollect)
    {
        try {

            # Generate hashed password
            $hashedPassword = bcrypt($dataCollect->get('password'));
            $dataCollect->put('password', $hashedPassword);

            # Create a new user
            $this->user = $this->userRepository->create($dataCollect->toArray());

        } catch (Exception $th) {
            throw new CustomException(__('Sorry! The system is unable to create a new user account.'));
        }
    }



    protected function findRefererIdFromRequest($request)
    {
        # I have intentionally thrown an exception
        throw new CustomException(__("The invitation code is invalid."));
    }



    protected function putReferrerId($referrerId)
    {
        # Update user profile and put referrerId into the user profile
        $this->user->update(['referrer_id' => $referrerId]);

    }

    // Other funtions ... 

   }