diff --git a/tests/test_mission.py b/tests/test_mission.py
index a26630b9..766fbdeb 100644
--- a/tests/test_mission.py
+++ b/tests/test_mission.py
@@ -1008,6 +1008,122 @@ def test_big_formation_action_right(self) -> None:
 
         self.assertEqual(task, m2_task)
 
+    def test_big_formation_action_leader(self) -> None:
+        m_name = "tests/missions/big-formation.miz"
+        m = dcs.mission.Mission()
+        m.load_file(m_name)
+
+        assert isinstance(m.coalition['blue'].country("Combined Joint Task Forces Blue")
+                          .plane_group[0].points[0].tasks[5], WWIIFollowBigFormation)
+
+        task = m.coalition['blue'].country("Combined Joint Task Forces Blue").plane_group[0].points[0].tasks[5]
+
+        self.assertNotIn("groupId", task.params)
+        self.assertNotIn("lastWptIndex", task.params)
+        self.assertEqual(task.params["formationType"], WWIIFollowBigFormation.FormationType.COMBAT_BOX_FOR_OPEN_FORMATION)
+        self.assertEqual(task.params["pos"], {"x": 0, "y": 0, "z": 0})
+        self.assertTrue(task.params["lastWptIndexFlagChangedManually"])
+        self.assertEqual(len(task.params), 7)
+
+        m2_name = "missions/saved_big-formation.miz"
+        m.save(m2_name)
+
+        m2 = dcs.mission.Mission()
+        m2.load_file(m2_name)
+
+        assert isinstance(m2.coalition['blue'].country("Combined Joint Task Forces Blue")
+                          .plane_group[0].points[0].tasks[5], WWIIFollowBigFormation)
+        m2_task = m.coalition['blue'].country("Combined Joint Task Forces Blue").plane_group[0].points[0].tasks[5]
+
+        self.assertEqual(task, m2_task)
+
+    def test_big_formation_action_left(self) -> None:
+        m_name = "tests/missions/big-formation.miz"
+        m = dcs.mission.Mission()
+        m.load_file(m_name)
+
+        assert isinstance(m.coalition['blue'].country("Combined Joint Task Forces Blue")
+                          .plane_group[1].points[0].tasks[5], WWIIFollowBigFormation)
+        task = m.coalition['blue'].country("Combined Joint Task Forces Blue").plane_group[1].points[0].tasks[5]
+
+        self.assertEqual(task.params["formationType"], WWIIFollowBigFormation.FormationType.JAVELIN_DOWN)
+        self.assertEqual(task.params["pos"], {"x": -480, "y": -70, "z": -240})
+        self.assertEqual(task.params["groupId"], 2)
+        self.assertEqual(task.params["posInGroup"], 2)
+        self.assertEqual(task.params["lastWptIndex"], 3)
+        self.assertTrue(task.params["lastWptIndexFlag"])
+        self.assertEqual(len(task.params), 9)
+
+        m2_name = "missions/saved_big-formation.miz"
+        m.save(m2_name)
+
+        m2 = dcs.mission.Mission()
+        m2.load_file(m2_name)
+
+        assert isinstance(m2.coalition['blue'].country("Combined Joint Task Forces Blue")
+                          .plane_group[1].points[0].tasks[5], WWIIFollowBigFormation)
+        m2_task = m.coalition['blue'].country("Combined Joint Task Forces Blue").plane_group[1].points[0].tasks[5]
+
+        self.assertEqual(task, m2_task)
+
+    def test_big_formation_action_back(self) -> None:
+        m_name = "tests/missions/big-formation.miz"
+        m = dcs.mission.Mission()
+        m.load_file(m_name)
+
+        assert isinstance(m.coalition['blue'].country("Combined Joint Task Forces Blue")
+                          .plane_group[2].points[0].tasks[5], WWIIFollowBigFormation)
+        task = m.coalition['blue'].country("Combined Joint Task Forces Blue").plane_group[2].points[0].tasks[5]
+
+        self.assertEqual(task.params["formationType"], WWIIFollowBigFormation.FormationType.COMBAT_BOX)
+        self.assertEqual(task.params["pos"], {"x": -320, "y": -50, "z": -0})
+        self.assertEqual(task.params["groupId"], 2)
+        self.assertEqual(task.params["posInBox"], 3)
+        self.assertEqual(task.params["lastWptIndex"], 3)
+        self.assertFalse(task.params["lastWptIndexFlag"])
+        self.assertEqual(len(task.params), 9)
+
+        m2_name = "missions/saved_big-formation.miz"
+        m.save(m2_name)
+
+        m2 = dcs.mission.Mission()
+        m2.load_file(m2_name)
+
+        assert isinstance(m2.coalition['blue'].country("Combined Joint Task Forces Blue")
+                          .plane_group[2].points[0].tasks[5], WWIIFollowBigFormation)
+        m2_task = m.coalition['blue'].country("Combined Joint Task Forces Blue").plane_group[2].points[0].tasks[5]
+
+        self.assertEqual(task, m2_task)
+
+    def test_big_formation_action_right(self) -> None:
+        m_name = "tests/missions/big-formation.miz"
+        m = dcs.mission.Mission()
+        m.load_file(m_name)
+
+        assert isinstance(m.coalition['blue'].country("Combined Joint Task Forces Blue")
+                          .plane_group[3].points[0].tasks[5], WWIIFollowBigFormation)
+        task = m.coalition['blue'].country("Combined Joint Task Forces Blue").plane_group[3].points[0].tasks[5]
+
+        self.assertEqual(task.params["formationType"], WWIIFollowBigFormation.FormationType.COMBAT_BOX_FOR_OPEN_FORMATION)
+        self.assertEqual(task.params["pos"], {"x": -160, "y": 50, "z": 240})
+        self.assertEqual(task.params["groupId"], 2)
+        self.assertEqual(task.params["posInBox"], 1)
+        self.assertEqual(task.params["lastWptIndex"], 3)
+        self.assertTrue(task.params["lastWptIndexFlag"])
+        self.assertEqual(len(task.params), 9)
+
+        m2_name = "missions/saved_big-formation.miz"
+        m.save(m2_name)
+
+        m2 = dcs.mission.Mission()
+        m2.load_file(m2_name)
+
+        assert isinstance(m2.coalition['blue'].country("Combined Joint Task Forces Blue")
+                          .plane_group[3].points[0].tasks[5], WWIIFollowBigFormation)
+        m2_task = m.coalition['blue'].country("Combined Joint Task Forces Blue").plane_group[3].points[0].tasks[5]
+
+        self.assertEqual(task, m2_task)
+
     def test_action_a_out_picture(self) -> None:
         mizname = "tests/missions/a_out_picture.miz"
         m = dcs.mission.Mission()