fix: avoid fuzzy order of assignments when sorting by date

src/Controller/Administrative/Assignment/IndexController.php

@@ -36,7 +36,7 @@ class IndexController extends AbstractController
             $request->query->getInt('page', 1),
             $request->query->getInt('limit', 10),
             [
-                'defaultSortFieldName' => 'destination.dateFrom',
+                'defaultSortFieldName' => ['destination.dateFrom', 'assignment.id'],
                 'defaultSortDirection' => 'asc',
             ]
         );