diff --git a/supervisor/homeassistant/core.py b/supervisor/homeassistant/core.py
index bdbe6217e..e89c6e44e 100644
--- a/supervisor/homeassistant/core.py
+++ b/supervisor/homeassistant/core.py
@@ -77,7 +77,7 @@ class HomeAssistantCore(JobGroup):
         super().__init__(coresys, JOB_GROUP_HOME_ASSISTANT_CORE)
         self.instance: DockerHomeAssistant = DockerHomeAssistant(coresys)
         self._error_state: bool = False
-        self._core_config: dict[str, Any] | None = None
+        self._cached_core_config: dict[str, Any] | None = None
         self._watchdog_listener: EventListener | None = None
 
     @property
@@ -86,9 +86,13 @@ class HomeAssistantCore(JobGroup):
         return self._error_state
 
     @property
-    def core_config(self) -> dict[str, Any] | None:
-        """Return cached Core config or None if not available."""
-        return self._core_config
+    def cached_core_config(self) -> dict[str, Any] | None:
+        """Return Core config captured when Core reached RUNNING state.
+
+        This is a snapshot from startup and does not reflect integrations
+        loaded at runtime (e.g. a user installing an integration after boot).
+        """
+        return self._cached_core_config
 
     async def ensure_started(self) -> None:
         """Ensure Home Assistant Core is running and setup is complete.
@@ -347,7 +351,7 @@ class HomeAssistantCore(JobGroup):
             await _update(to_version)
 
         if not self.error_state and rollback:
-            config = self._core_config
+            config = self.cached_core_config
 
             # Verify that the frontend is loaded
             if config is None:
@@ -432,7 +436,7 @@ class HomeAssistantCore(JobGroup):
     )
     async def stop(self, *, remove_container: bool = False) -> None:
         """Stop Home Assistant Docker."""
-        self._core_config = None
+        self._cached_core_config = None
         try:
             return await self.instance.stop(remove_container=remove_container)
         except DockerError as err:
@@ -543,7 +547,7 @@ class HomeAssistantCore(JobGroup):
             return
         _LOGGER.info("Wait until Home Assistant is ready")
 
-        self._core_config = None
+        self._cached_core_config = None
 
         deadline = datetime.now() + STARTUP_API_RESPONSE_TIMEOUT
         last_state = None
@@ -570,7 +574,7 @@ class HomeAssistantCore(JobGroup):
                     _LOGGER.info("Detect a running Home Assistant instance")
                     self._error_state = False
                     with suppress(HomeAssistantAPIError):
-                        self._core_config = (
+                        self._cached_core_config = (
                             await self.sys_homeassistant.api.get_config()
                         )
                     return
diff --git a/supervisor/homeassistant/module.py b/supervisor/homeassistant/module.py
index 0f0592d44..2f69a4c20 100644
--- a/supervisor/homeassistant/module.py
+++ b/supervisor/homeassistant/module.py
@@ -358,7 +358,7 @@ class HomeAssistant(FileConfiguration, CoreSysAttributes):
         ):
             return
 
-        if not (config := self.core.core_config):
+        if not (config := self.core.cached_core_config):
             _LOGGER.debug("Core config not available, skipping hardware event")
             return
 
diff --git a/tests/api/test_homeassistant.py b/tests/api/test_homeassistant.py
index 47cdd2321..9c00392d1 100644
--- a/tests/api/test_homeassistant.py
+++ b/tests/api/test_homeassistant.py
@@ -279,7 +279,7 @@ async def test_api_progress_updates_home_assistant_update(
     logs = load_json_fixture("docker_pull_image_log.json")
     coresys.docker.images.pull.return_value = AsyncIterator(logs)
     coresys.homeassistant.version = AwesomeVersion("2025.8.0")
-    coresys.homeassistant.core._core_config = {"components": ["frontend"]}
+    coresys.homeassistant.core._cached_core_config = {"components": ["frontend"]}  # noqa: SLF001  # pylint: disable=protected-access
 
     with (
         patch.object(
@@ -445,7 +445,7 @@ async def test_update_frontend_check_success(api_client: TestClient, coresys: Co
     """Test that update succeeds when frontend check passes."""
     coresys.hardware.disk.get_disk_free_space = lambda x: 5000
     coresys.homeassistant.version = AwesomeVersion("2025.8.0")
-    coresys.homeassistant.core._core_config = {"components": ["frontend"]}
+    coresys.homeassistant.core._cached_core_config = {"components": ["frontend"]}  # noqa: SLF001  # pylint: disable=protected-access
 
     with (
         patch.object(
@@ -483,7 +483,7 @@ async def test_update_frontend_check_fails_triggers_rollback(
             # Rollback succeeds
             coresys.homeassistant.version = AwesomeVersion("2025.8.0")
 
-    coresys.homeassistant.core._core_config = {"components": ["frontend"]}
+    coresys.homeassistant.core._cached_core_config = {"components": ["frontend"]}  # noqa: SLF001  # pylint: disable=protected-access
 
     with (
         patch.object(DockerInterface, "update", new=mock_update),
diff --git a/tests/homeassistant/test_api.py b/tests/homeassistant/test_api.py
index 35125ced3..d8807c9f0 100644
--- a/tests/homeassistant/test_api.py
+++ b/tests/homeassistant/test_api.py
@@ -9,6 +9,15 @@ import pytest
 
 from supervisor.coresys import CoreSys
 from supervisor.exceptions import HomeAssistantAPIError
+from supervisor.homeassistant.api import HomeAssistantAPI
+
+
+@pytest.fixture(autouse=True)
+def _restore_get_config(coresys: CoreSys) -> None:
+    """Restore real get_config replaced by global mock in conftest."""
+    coresys.homeassistant.api.get_config = HomeAssistantAPI.get_config.__get__(
+        coresys.homeassistant.api
+    )
 
 
 async def test_check_frontend_available_success(coresys: CoreSys):
diff --git a/tests/homeassistant/test_core.py b/tests/homeassistant/test_core.py
index 29e895398..bacd627ca 100644
--- a/tests/homeassistant/test_core.py
+++ b/tests/homeassistant/test_core.py
@@ -472,7 +472,7 @@ async def test_api_check_success(
 
     assert coresys.homeassistant.api.get_api_state.call_count == 1
     assert "Detect a running Home Assistant instance" in caplog.text
-    assert coresys.homeassistant.core.core_config == {"components": ["frontend"]}
+    assert coresys.homeassistant.core.cached_core_config == {"components": ["frontend"]}
 
 
 async def test_api_check_database_migration(
@@ -511,7 +511,7 @@ async def test_api_check_database_migration(
 
     assert coresys.homeassistant.api.get_api_state.call_count == 51
     assert "Detect a running Home Assistant instance" in caplog.text
-    assert coresys.homeassistant.core.core_config == {"components": ["frontend"]}
+    assert coresys.homeassistant.core.cached_core_config == {"components": ["frontend"]}
 
 
 async def test_api_check_timeout_clears_core_config(
@@ -524,7 +524,7 @@ async def test_api_check_timeout_clears_core_config(
     coresys.homeassistant.api.get_api_state.return_value = None
 
     # Seed the cache so we can verify it gets cleared
-    coresys.homeassistant.core._core_config = {"components": ["frontend"]}
+    coresys.homeassistant.core._cached_core_config = {"components": ["frontend"]}  # noqa: SLF001  # pylint: disable=protected-access
 
     async def mock_instance_start(*_):
         container.show.return_value["State"]["Status"] = "running"
@@ -545,7 +545,7 @@ async def test_api_check_timeout_clears_core_config(
         ):
             await coresys.homeassistant.core.start()
 
-    assert coresys.homeassistant.core.core_config is None
+    assert coresys.homeassistant.core.cached_core_config is None
 
 
 async def test_stop_clears_core_config(coresys: CoreSys, container: DockerContainer):
@@ -554,12 +554,12 @@ async def test_stop_clears_core_config(coresys: CoreSys, container: DockerContai
     container.show.return_value["State"]["Running"] = True
 
     # Seed the cache
-    coresys.homeassistant.core._core_config = {"components": ["frontend", "usb"]}
-    assert coresys.homeassistant.core.core_config is not None
+    coresys.homeassistant.core._cached_core_config = {"components": ["frontend", "usb"]}  # noqa: SLF001  # pylint: disable=protected-access
+    assert coresys.homeassistant.core.cached_core_config is not None
 
     await coresys.homeassistant.core.stop()
 
-    assert coresys.homeassistant.core.core_config is None
+    assert coresys.homeassistant.core.cached_core_config is None
 
 
 async def test_core_loads_wrong_image_for_machine(