diff --git a/tests/api/test_homeassistant.py b/tests/api/test_homeassistant.py
index 377aeccdd..7f8731421 100644
--- a/tests/api/test_homeassistant.py
+++ b/tests/api/test_homeassistant.py
@@ -305,6 +305,8 @@ async def test_api_progress_updates_home_assistant_update(
         and evt.args[0]["data"]["event"] == WSEvent.JOB
         and evt.args[0]["data"]["data"]["name"] == "home_assistant_core_update"
     ]
+    # Count-based progress: 4 layers (2 cached = 50%, 2 pulling = 25% each)
+    # Cached layers contribute immediately when downloading starts
     assert events[:5] == [
         {
             "stage": None,
@@ -318,34 +320,34 @@ async def test_api_progress_updates_home_assistant_update(
         },
         {
             "stage": None,
-            "progress": 0.1,
+            "progress": 50.0,
             "done": False,
         },
         {
             "stage": None,
-            "progress": 1.7,
+            "progress": 54.6,
             "done": False,
         },
         {
             "stage": None,
-            "progress": 4.0,
+            "progress": 62.8,
             "done": False,
         },
     ]
     assert events[-5:] == [
         {
             "stage": None,
-            "progress": 98.2,
+            "progress": 95.7,
             "done": False,
         },
         {
             "stage": None,
-            "progress": 98.3,
+            "progress": 97.1,
             "done": False,
         },
         {
             "stage": None,
-            "progress": 99.3,
+            "progress": 98.4,
             "done": False,
         },
         {
diff --git a/tests/api/test_store.py b/tests/api/test_store.py
index 8e9414edf..e9a9fc659 100644
--- a/tests/api/test_store.py
+++ b/tests/api/test_store.py
@@ -764,6 +764,8 @@ async def test_api_progress_updates_addon_install_update(
         and evt.args[0]["data"]["data"]["name"] == job_name
         and evt.args[0]["data"]["data"]["reference"] == addon_slug
     ]
+    # Count-based progress: 4 layers (2 cached = 50%, 2 pulling = 25% each)
+    # Cached layers contribute immediately when downloading starts
     assert events[:4] == [
         {
             "stage": None,
@@ -772,34 +774,34 @@ async def test_api_progress_updates_addon_install_update(
         },
         {
             "stage": None,
-            "progress": 0.1,
+            "progress": 50.0,
             "done": False,
         },
         {
             "stage": None,
-            "progress": 1.7,
+            "progress": 54.6,
             "done": False,
         },
         {
             "stage": None,
-            "progress": 4.0,
+            "progress": 62.8,
             "done": False,
         },
     ]
     assert events[-5:] == [
         {
             "stage": None,
-            "progress": 98.2,
+            "progress": 95.7,
             "done": False,
         },
         {
             "stage": None,
-            "progress": 98.3,
+            "progress": 97.1,
             "done": False,
         },
         {
             "stage": None,
-            "progress": 99.3,
+            "progress": 98.4,
             "done": False,
         },
         {
diff --git a/tests/api/test_supervisor.py b/tests/api/test_supervisor.py
index e255bace0..36adb48f3 100644
--- a/tests/api/test_supervisor.py
+++ b/tests/api/test_supervisor.py
@@ -358,6 +358,8 @@ async def test_api_progress_updates_supervisor_update(
         and evt.args[0]["data"]["event"] == WSEvent.JOB
         and evt.args[0]["data"]["data"]["name"] == "supervisor_update"
     ]
+    # Count-based progress: 4 layers (2 cached = 50%, 2 pulling = 25% each)
+    # Cached layers contribute immediately when downloading starts
     assert events[:4] == [
         {
             "stage": None,
@@ -366,34 +368,34 @@ async def test_api_progress_updates_supervisor_update(
         },
         {
             "stage": None,
-            "progress": 0.1,
+            "progress": 50.0,
             "done": False,
         },
         {
             "stage": None,
-            "progress": 1.7,
+            "progress": 54.6,
             "done": False,
         },
         {
             "stage": None,
-            "progress": 4.0,
+            "progress": 62.8,
             "done": False,
         },
     ]
     assert events[-5:] == [
         {
             "stage": None,
-            "progress": 98.2,
+            "progress": 95.7,
             "done": False,
         },
         {
             "stage": None,
-            "progress": 98.3,
+            "progress": 97.1,
             "done": False,
         },
         {
             "stage": None,
-            "progress": 99.3,
+            "progress": 98.4,
             "done": False,
         },
         {