diff --git a/django/db/models/query.py b/django/db/models/query.py
index 2d9bcee9bc96..748a0508b2ee 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -747,6 +747,7 @@ async def acreate(self, **kwargs):
     def _prepare_for_bulk_create(self, objs):
         objs_with_pk, objs_without_pk = [], []
         for obj in objs:
+            obj._prepare_related_fields_for_save(operation_name="bulk_create")
             if isinstance(obj.pk, DatabaseDefault):
                 objs_without_pk.append(obj)
             elif obj._is_pk_set():
@@ -757,7 +758,6 @@ def _prepare_for_bulk_create(self, objs):
                     objs_with_pk.append(obj)
                 else:
                     objs_without_pk.append(obj)
-            obj._prepare_related_fields_for_save(operation_name="bulk_create")
         return objs_with_pk, objs_without_pk
 
     def _check_bulk_create_options(
diff --git a/docs/releases/6.0.8.txt b/docs/releases/6.0.8.txt
index 4f05b218da02..8ce8e50f5308 100644
--- a/docs/releases/6.0.8.txt
+++ b/docs/releases/6.0.8.txt
@@ -11,4 +11,7 @@ bugs in 6.0.7.
 Bugfixes
 ========
 
-* ...
+* Fixed a regression in Django 6.0 that caused
+  :meth:`~django.db.models.query.QuerySet.bulk_create` to crash on databases
+  that support returning rows from bulk inserts when a related object providing
+  the primary key was saved after assignment (:ticket:`37234`).
diff --git a/tests/basic/tests.py b/tests/basic/tests.py
index a81724b70f51..d8f95b43aac7 100644
--- a/tests/basic/tests.py
+++ b/tests/basic/tests.py
@@ -1099,3 +1099,24 @@ def test_refresh_overwrites_queryset_fields(self):
         with self.assertNumQueries(1):
             a.refresh_from_db(fields=["headline"], from_queryset=from_queryset)
             self.assertEqual(a.headline, headline)
+
+    def test_refresh_copies_fetch_mode_from_plucked_instance(self):
+        a = Article.objects.create(pub_date=datetime.now())
+        fa = FeaturedArticle.objects.fetch_mode(models.FETCH_PEERS).create(article=a)
+
+        from_queryset = FeaturedArticle.objects.fetch_mode(models.RAISE).select_related(
+            "article"
+        )
+        fa.refresh_from_db(from_queryset=from_queryset)
+        self.assertEqual(fa._state.fetch_mode, models.FETCH_PEERS)
+        self.assertEqual(fa.article._state.fetch_mode, models.RAISE)
+
+    def test_refresh_ignores_fetch_mode_if_no_instance_plucked(self):
+        a = Article.objects.create(pub_date=datetime.now())
+        fa = FeaturedArticle.objects.fetch_mode(models.FETCH_PEERS).create(article=a)
+
+        # This queryset's fetch mode is not used because no fields are plucked.
+        from_queryset = FeaturedArticle.objects.fetch_mode(models.RAISE)
+        fa.refresh_from_db(from_queryset=from_queryset)
+        self.assertEqual(fa._state.fetch_mode, models.FETCH_PEERS)
+        self.assertEqual(fa.article._state.fetch_mode, models.FETCH_PEERS)
diff --git a/tests/bulk_create/tests.py b/tests/bulk_create/tests.py
index 397fcb9186c3..eaf4bc05083c 100644
--- a/tests/bulk_create/tests.py
+++ b/tests/bulk_create/tests.py
@@ -439,6 +439,13 @@ def test_nullable_fk_after_parent_bulk_create(self):
         child = NullableFields.objects.get(integer_field=88)
         self.assertEqual(child.auto_field, parent)
 
+    def test_pk_from_related_instance_saved_after_init(self):
+        country = Country(name="Syldavia", iso_two_letter="SW")
+        related = RelatedModel(country=country)
+        country.save()
+        RelatedModel.objects.bulk_create([related])
+        self.assertEqual(related.country_id, country.pk)
+
     def test_unsaved_parent(self):
         parent = NoFields()
         msg = (
diff --git a/tests/test_client/tests.py b/tests/test_client/tests.py
index 98f01827d0a7..cc66a157b0a5 100644
--- a/tests/test_client/tests.py
+++ b/tests/test_client/tests.py
@@ -908,6 +908,16 @@ def test_redirect_with_http_host(self):
         )
         self.assertEqual(response.content, b"hostname2")
 
+    @override_settings(PREPEND_WWW=True, ALLOWED_HOSTS=["testserver", "www.testserver"])
+    def test_prepend_www_follow_redirect(self):
+        response = self.client.get("/get_view/", follow=True)
+        self.assertRedirects(
+            response,
+            "http://www.testserver/get_view/",
+            status_code=301,
+            target_status_code=200,
+        )
+
     def test_external_redirect_without_trailing_slash(self):
         """
         Client._handle_redirects() with an empty path.