diff --git a/django/test/runner.py b/django/test/runner.py
index 25089a6db1b1..41c9dbd10ca9 100644
--- a/django/test/runner.py
+++ b/django/test/runner.py
@@ -463,9 +463,6 @@ def _init_worker(
             process_setup(*process_setup_args)
         django.setup()
         setup_test_environment(debug=debug_mode)
-        call_command(
-            "check", stdout=io.StringIO(), stderr=io.StringIO(), databases=used_aliases
-        )
 
     db_aliases = used_aliases if used_aliases is not None else connections
     for alias in db_aliases:
@@ -477,6 +474,11 @@ def _init_worker(
                 connection._test_serialized_contents = value
         connection.creation.setup_worker_connection(_worker_id)
 
+    if is_spawn_or_forkserver:
+        call_command(
+            "check", stdout=io.StringIO(), stderr=io.StringIO(), databases=used_aliases
+        )
+
 
 def _run_subsuite(args):
     """
diff --git a/tests/test_runner/test_parallel.py b/tests/test_runner/test_parallel.py
index fa129da76800..32cc971d305d 100644
--- a/tests/test_runner/test_parallel.py
+++ b/tests/test_runner/test_parallel.py
@@ -32,6 +32,12 @@ class ExceptionThatFailsUnpickling(Exception):
     def __init__(self, arg):
         super().__init__()
 
+    def __reduce__(self):
+        # tblib 3.2+ makes exception subclasses picklable by default.
+        # Return (cls, ()) so the constructor fails on unpickle, preserving
+        # the needed behavior for test_pickle_errors_detection.
+        return (self.__class__, ())
+
 
 class ParallelTestRunnerTest(SimpleTestCase):
     """
@@ -170,6 +176,8 @@ def test_pickle_errors_detection(self):
         result = RemoteTestResult()
         result._confirm_picklable(picklable_error)
 
+        # The exception can be pickled but not unpickled.
+        pickle.dumps(not_unpicklable_error)
         msg = "__init__() missing 1 required positional argument"
         with self.assertRaisesMessage(TypeError, msg):
             result._confirm_picklable(not_unpicklable_error)