diff --git a/lobby/tests.py b/lobby/tests.py
index 90a7878..d69562f 100644
--- a/lobby/tests.py
+++ b/lobby/tests.py
@@ -1312,6 +1312,17 @@ class UiScreenTests(TestCase):
             'var HOST_SHELL_ROUTES={lobby:"lobby",lie:"lie",guess:"guess",reveal:"reveal",scoreboard:"scoreboard",finished:"finished"};',
         )
 
+    def test_host_screen_template_gates_next_round_and_finish_on_scoreboard_phase(self):
+        self.client.login(username="host_ui", password="secret123")
+
+        response = self.client.get(reverse("lobby:host_screen"))
+
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, 'if(nextRoundBtn){nextRoundBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="scoreboard";}')
+        self.assertContains(response, 'if(finishGameBtn){finishGameBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="scoreboard";}')
+        self.assertNotContains(response, 'if(nextRoundBtn){nextRoundBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="reveal";}')
+        self.assertNotContains(response, 'if(finishGameBtn){finishGameBtn.disabled=hostActionInFlight||sessionDetailInFlight||!hasCode||phase!=="reveal";}')
+
     @override_settings(USE_SPA_UI=True)
     def test_host_screen_deeplink_normalizes_redundant_slashes_when_feature_flag_enabled(self):
         self.client.login(username="host_ui", password="secret123")