From 2c7a646b5cded89129b3cdbbbdea26b6a98cb320 Mon Sep 17 00:00:00 2001
From: Sebastian Breuers <sebastian.breuers@elfin.de>
Date: Tue, 17 Feb 2026 11:21:33 +0100
Subject: [PATCH] fix: identify already tracked resources by ID AND type

currently entities with same ID are skipped since different entities can have
the same ID.
---
 src/JsonApi/Serializer/ItemNormalizer.php | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/JsonApi/Serializer/ItemNormalizer.php b/src/JsonApi/Serializer/ItemNormalizer.php
index 3ecb096b0f..76e7dc0607 100644
--- a/src/JsonApi/Serializer/ItemNormalizer.php
+++ b/src/JsonApi/Serializer/ItemNormalizer.php
@@ -551,10 +551,19 @@ private function getRelatedResources(object $object, ?string $format, array $con
      */
     private function addIncluded(array $data, array &$included, array &$context): void
     {
-        if (isset($data['id']) && !\in_array($data['id'], $context['api_included_resources'], true)) {
+        if (!isset($data['id'], $data['type'])) {
+            return;
+        }
+
+        $iriLike = $data['type'] . ':' . $data['id'];
+
+        // Initialize tracking array if needed
+        $context['api_included_resources'] ??= [];
+
+        if (!\in_array($iriLike, $context['api_included_resources'], true)) {
             $included[] = $data;
             // Track already included resources
-            $context['api_included_resources'][] = $data['id'];
+            $context['api_included_resources'][] = $iriLike;
         }
     }