class TopicNormalizer implements NormalizerInterface, NormalizerAwareInterface
{
    use NormalizerAwareTrait;

+    private const ALREADY_CALLED = self::class.'_already_called';
+
    public function __construct(
        private UrlGeneratorInterface $router,
    ) {
    }

    public function normalize($topic, string $format = null, array $context = []): array
    {
+       $context[self::ALREADY_CALLED] = true;
+
        $data = $this->normalizer->normalize($topic, $format, $context);

        // Here, add, edit, or delete some data:
        $data['href']['self'] = $this->router->generate('topic_show', [
            'id' => $topic->getId(),
        ], UrlGeneratorInterface::ABSOLUTE_URL);

        return $data;
    }

    public function supportsNormalization($data, string $format = null, array $context = []): bool
    {
+        if ($context[self::ALREADY_CALLED] ?? false) {
+            return false;
+        }
+
        return $data instanceof Topic;
    }

    public function getSupportedTypes(?string $format): array
    {
        return [
-             Topic::class => true,
+             Topic::class => false,
        ];
    }
}