diff --git a/src/open_inwoner/cms/products/tests/test_plugin_categories.py b/src/open_inwoner/cms/products/tests/test_plugin_categories.py
index 8aeb96444b..018fd2beda 100644
--- a/src/open_inwoner/cms/products/tests/test_plugin_categories.py
+++ b/src/open_inwoner/cms/products/tests/test_plugin_categories.py
@@ -7,7 +7,7 @@
 import requests_mock
 from cms.apphook_pool import apphook_pool
 from dateutil.relativedelta import relativedelta
-from django_webtest import WebTest
+from django_webtest import TransactionWebTest, WebTest
 from furl import furl
 from requests import RequestException
 from zgw_consumers.api_models.constants import VertrouwelijkheidsAanduidingen
@@ -322,7 +322,7 @@ def test_only_published_categories_exist_in_home_page_when_logged_in_with_eherke
 
 
 @override_settings(ROOT_URLCONF="open_inwoner.cms.tests.urls")
-class TestCategoriesCaseFiltering(ClearCachesMixin, WebTest):
+class TestCategoriesCaseFiltering(ClearCachesMixin, TransactionWebTest):
     def setUp(self):
         super().setUp()
 
diff --git a/src/open_inwoner/pdc/managers.py b/src/open_inwoner/pdc/managers.py
index 26dab6c8e5..f060845752 100644
--- a/src/open_inwoner/pdc/managers.py
+++ b/src/open_inwoner/pdc/managers.py
@@ -9,7 +9,7 @@
 from open_inwoner.accounts.models import User
 from open_inwoner.configurations.models import SiteConfiguration
 from open_inwoner.openzaak.api_models import Zaak
-from open_inwoner.openzaak.clients import build_zaken_client
+from open_inwoner.openzaak.clients import MultiZgwClientProxy, build_zaken_clients
 from open_inwoner.openzaak.models import ZaakTypeConfig
 from open_inwoner.openzaak.utils import get_user_fetch_parameters
 
@@ -54,11 +54,13 @@ def filter_by_zaken_for_request(self, request):
         if not request.user.bsn and not request.user.kvk:
             return self
 
-        client = build_zaken_client()
-        if client is None:
-            return self.none()
+        clients = build_zaken_clients()
+        proxy_result = MultiZgwClientProxy(clients)
+        proxy_result = proxy_result.fetch_cases(**get_user_fetch_parameters(request))
+        if proxy_result.has_errors:
+            self.log_system_action("unable to retrieve cases", user=request.user)
 
-        cases = client.fetch_cases(**get_user_fetch_parameters(request))
+        cases = proxy_result.join_results()
 
         return self.filter_by_zaken(cases)