diff --git a/src/plone/restapi/serializer/relationfield.py b/src/plone/restapi/serializer/relationfield.py
index d54cadb9d..3115568d0 100644
--- a/src/plone/restapi/serializer/relationfield.py
+++ b/src/plone/restapi/serializer/relationfield.py
@@ -18,7 +18,7 @@
 @implementer(IJsonCompatible)
 def relationvalue_converter(value):
     if value.to_object:
-        request = getRequest()
+        request = getRequest().clone()
         request.form["metadata_fields"] = ["UID"]
         summary = getMultiAdapter((value.to_object, request), ISerializeToJsonSummary)()
         return json_compatible(summary)
diff --git a/src/plone/restapi/tests/test_dxfield_serializer.py b/src/plone/restapi/tests/test_dxfield_serializer.py
index bac16ffcc..625ea83d5 100644
--- a/src/plone/restapi/tests/test_dxfield_serializer.py
+++ b/src/plone/restapi/tests/test_dxfield_serializer.py
@@ -325,6 +325,19 @@ def test_relationlist_field_serialization_returns_list(self):
             value,
         )
 
+    def test_relation_field_serialization_do_not_change_request(self):
+        self.request.form["metadata_fields"] = ["foo", "bar"]
+        doc2 = self.portal[
+            self.portal.invokeFactory(
+                "DXTestDocument",
+                id="doc2",
+                title="Referenceable Document",
+                description="Description 2",
+            )
+        ]
+        self.serialize("test_relationchoice_field", doc2)
+        self.assertEqual(self.request.form["metadata_fields"], ["foo", "bar"])
+
     def test_remoteurl_field_in_links_get_converted(self):
         link = self.portal[
             self.portal.invokeFactory(