Fix restoring disabled_by flag of deleted devices (#151313)

homeassistant/helpers/device_registry.py

@@ -944,6 +944,8 @@ class DeviceRegistry(BaseRegistry[dict[str, list[dict[str, Any]]]]):
                     identifiers,
                     disabled_by,
                 )
+                disabled_by = UNDEFINED
+
             self.devices[device.id] = device
             # If creating a new device, default to the config entry name
             if device_info_type == "primary" and (not name or name is UNDEFINED):

tests/helpers/test_device_registry.py

@@ -4066,6 +4066,7 @@ async def test_restore_disabled_by(
         config_subentry_id=None,
         configuration_url="http://config_url_new.bla",
         connections={(dr.CONNECTION_NETWORK_MAC, "12:34:56:AB:CD:EF")},
+        disabled_by=None,
         entry_type=None,
         hw_version="hw_version_new",
         identifiers={("bridgeid", "0123")},