diff --git a/pontoon/administration/views.py b/pontoon/administration/views.py
index e46b81dca4..5f8d1b21e2 100644
--- a/pontoon/administration/views.py
+++ b/pontoon/administration/views.py
@@ -182,12 +182,10 @@ def manage_project(request, slug=None, template="admin_project.html"):
                     .delete()
                 )
 
-                project_locales = [
-                    ProjectLocale(project=project, locale=locale) for locale in locales
-                ]
-                ProjectLocale.objects.bulk_create(
-                    project_locales, ignore_conflicts=True
-                )
+                for locale in locales:
+                    # The implicit pre_save and post_save signals sent here are required
+                    # to maintain django-guardian permissions.
+                    ProjectLocale.objects.get_or_create(project=project, locale=locale)
 
                 project_locales = ProjectLocale.objects.filter(project=project)
 
diff --git a/pontoon/base/migrations/0065_fix_projectlocale_permissions.py b/pontoon/base/migrations/0065_fix_projectlocale_permissions.py
new file mode 100644
index 0000000000..7d9af20f08
--- /dev/null
+++ b/pontoon/base/migrations/0065_fix_projectlocale_permissions.py
@@ -0,0 +1,48 @@
+from django.db import migrations
+
+from pontoon.base.models import ProjectLocale
+from pontoon.base.signals import assign_group_permissions, create_group
+
+
+def fix_projectlocale_permissions(apps, schema_editor):
+    for project, locale in [
+        ("common-voice", "cdo"),
+        ("common-voice", "dar"),
+        ("common-voice", "nqo"),
+        ("common-voice", "shn"),
+        ("firefox-bridge", "de"),
+        ("firefox-bridge", "fr"),
+        ("firefox-bridge", "it"),
+        ("firefox-multi-account-containers", "fur"),
+        ("firefox-profiler", "en-CA"),
+        ("firefox-profiler", "fur"),
+        ("firefox-profiler", "tr"),
+    ]:
+        try:
+            project_locale = ProjectLocale.objects.get(
+                project__slug=project, locale__code=locale
+            )
+            create_group(
+                project_locale,
+                "translators",
+                ["can_translate_project_locale"],
+                f"{project}/{locale}",
+            )
+            assign_group_permissions(
+                project_locale, "translators", ["can_translate_project_locale"]
+            )
+        except ProjectLocale.DoesNotExist:
+            pass
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("base", "0064_populate_unique_id"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            code=fix_projectlocale_permissions,
+            reverse_code=migrations.RunPython.noop,
+        ),
+    ]