diff --git a/dash/_callback.py b/dash/_callback.py
index 54a2e5a64c..7471ddea55 100644
--- a/dash/_callback.py
+++ b/dash/_callback.py
@@ -449,7 +449,9 @@ def add_context(*args, **kwargs):
                     progress = callback_manager.get_progress(cache_key)
                     if progress:
                         response["progress"] = {
-                            str(x): progress[i] for i, x in enumerate(progress_outputs)
+                            str(x): progress[i]
+                            for i, x in enumerate(progress_outputs)
+                            if not isinstance(progress[i], NoUpdate)
                         }
 
                 output_value = callback_manager.get_result(cache_key, job_id)
diff --git a/tests/integration/long_callback/app_progress_delete.py b/tests/integration/long_callback/app_progress_delete.py
index 2fdf08af61..50926e6091 100644
--- a/tests/integration/long_callback/app_progress_delete.py
+++ b/tests/integration/long_callback/app_progress_delete.py
@@ -1,4 +1,4 @@
-from dash import Dash, Input, Output, State, html, clientside_callback
+from dash import Dash, Input, Output, State, html, clientside_callback, no_update
 import time
 
 from tests.integration.long_callback.utils import get_long_callback_manager
@@ -16,6 +16,7 @@
         html.Div(0, id="progress-counter"),
     ]
 )
+app.test_lock = lock = long_callback_manager.test_lock
 
 clientside_callback(
     "function(_, previous) { return parseInt(previous) + 1;}",
@@ -35,9 +36,12 @@
     prevent_initial_call=True,
 )
 def on_bg_progress(set_progress, _):
-    set_progress("start")
-    time.sleep(2)
-    set_progress("stop")
+    with lock:
+        set_progress("start")
+        time.sleep(0.5)
+        set_progress("stop")
+        time.sleep(0.5)
+        set_progress(no_update)
     return "done"
 
 
diff --git a/tests/integration/long_callback/test_basic_long_callback014.py b/tests/integration/long_callback/test_basic_long_callback014.py
index 47ff2f1155..826407f210 100644
--- a/tests/integration/long_callback/test_basic_long_callback014.py
+++ b/tests/integration/long_callback/test_basic_long_callback014.py
@@ -13,5 +13,6 @@ def test_lcbc014_progress_delete(dash_duo, manager):
         dash_duo.start_server(app)
         dash_duo.find_element("#start").click()
         dash_duo.wait_for_text_to_equal("#output", "done")
-
-        assert dash_duo.find_element("#progress-counter").text == "2"
+        with app.test_lock:
+            assert dash_duo.find_element("#progress-output").text == "stop"
+            assert dash_duo.find_element("#progress-counter").text == "2"