diff --git a/core/modules/path/tests/src/Functional/NodeJsonPathTest.php b/core/modules/path/tests/src/Functional/NodeJsonPathTest.php
index fe1ea0a..7e6584d 100644
--- a/core/modules/path/tests/src/Functional/NodeJsonPathTest.php
+++ b/core/modules/path/tests/src/Functional/NodeJsonPathTest.php
@@ -20,6 +20,14 @@ class NodeJsonPathTest extends NodeJsonCookieTest {
   /**
    * {@inheritdoc}
    */
+  public function setUp() {
+    parent::setUp();
+    static::$patchProtectedFieldNames[] = 'path';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   protected function createEntity() {
     $node = parent::createEntity();
     $node->path->alias = '/llama';
diff --git a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
index 992e3b0..da3f670 100644
--- a/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
+++ b/core/modules/rest/tests/src/Functional/EntityResource/EntityResourceTestBase.php
@@ -688,7 +688,8 @@ public function testPost() {
     // 201 for well-formed request.
     $response = $this->request('POST', $url, $request_options);
     $this->assertResourceResponse(201, FALSE, $response);
-    $this->assertSame([str_replace($this->entity->id(), static::$firstCreatedEntityId, $this->entity->toUrl('canonical')->setAbsolute(TRUE)->toString())], $response->getHeader('Location'));
+    $unserialized = $this->serializer->deserialize((string) $response->getBody(), get_class($this->entity), static::$format);
+    $this->assertSame([$unserialized->toUrl('canonical')->setAbsolute(TRUE)->toString()], $response->getHeader('Location'));
     $this->assertFalse($response->hasHeader('X-Drupal-Cache'));
 
 
@@ -708,7 +709,8 @@ public function testPost() {
     // 201 for well-formed request.
     $response = $this->request('POST', $url, $request_options);
     $this->assertResourceResponse(201, FALSE, $response);
-    $this->assertSame([str_replace($this->entity->id(), static::$secondCreatedEntityId, $this->entity->toUrl('canonical')->setAbsolute(TRUE)->toString())], $response->getHeader('Location'));
+    $unserialized = $this->serializer->deserialize((string) $response->getBody(), get_class($this->entity), static::$format);
+    $this->assertSame([$unserialized->toUrl('canonical')->setAbsolute(TRUE)->toString()], $response->getHeader('Location'));
     $this->assertFalse($response->hasHeader('X-Drupal-Cache'));
   }