fix(state): no location header without output

fixes #6352

features/jsonld/no_output.feature

@@ -0,0 +1,10 @@
+Feature: Disable Id generation on anonymous resource collections
+
+  @!mongodb
+  Scenario: Post to an output false should not generate an IRI
+    When I add "Content-Type" header equal to "application/ld+json"
+    And I send a "POST" request to "/no_iri_messages" with body:
+    """
+    {}
+    """
+    Then the response status code should be 202

src/State/Processor/RespondProcessor.php

@@ -88,7 +88,11 @@ public function process(mixed $data, Operation $operation, array $uriVariables =
         $method = $request->getMethod();
         $originalData = $context['original_data'] ?? null;
 
-        if ($hasData = ($this->resourceClassResolver && $originalData && \is_object($originalData) && $this->resourceClassResolver->isResourceClass($this->getObjectClass($originalData))) && $this->iriConverter) {
+        $outputMetadata = $operation->getOutput() ?? ['class' => $operation->getClass()];
+        $hasOutput = \is_array($outputMetadata) && \array_key_exists('class', $outputMetadata) && null !== $outputMetadata['class'];
+        $hasData = !$hasOutput ? false : ($this->resourceClassResolver && $originalData && \is_object($originalData) && $this->resourceClassResolver->isResourceClass($this->getObjectClass($originalData)));
+
+        if ($hasData && $this->iriConverter) {
             if (
                 !isset($headers['Location'])
                 && 300 <= $status && $status < 400

tests/Fixtures/TestBundle/ApiResource/Issue6352/NoIriMessage.php

@@ -0,0 +1,27 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue6352;
+
+use ApiPlatform\Metadata\ApiResource;
+use ApiPlatform\Metadata\NotExposed;
+use ApiPlatform\Metadata\Post;
+
+#[ApiResource(operations: [
+    new NotExposed(),
+    new Post(status: 202, output: false),
+])]
+class NoIriMessage
+{
+    public ?int $id = null;
+}