diff --git a/homeassistant/helpers/device_registry.py b/homeassistant/helpers/device_registry.py
index 908db74d40d..c631af14ee5 100644
--- a/homeassistant/helpers/device_registry.py
+++ b/homeassistant/helpers/device_registry.py
@@ -146,40 +146,34 @@ class DeviceRegistryStore(storage.Store[dict[str, list[dict[str, Any]]]]):
     """Store entity registry data."""
 
     async def _async_migrate_func(
-        self, old_major_version: int, old_minor_version: int, old_data: dict[str, Any]
+        self,
+        old_major_version: int,
+        old_minor_version: int,
+        old_data: dict[str, list[dict[str, Any]]],
     ) -> dict[str, Any]:
         """Migrate to the new version."""
         if old_major_version < 2:
             if old_minor_version < 2:
-                # From version 1.1
+                # Version 1.2 implements migration and freezes the available keys,
+                # populate keys which were introduced before version 1.2
                 for device in old_data["devices"]:
-                    # Introduced in 0.110
+                    device.setdefault("area_id", None)
+                    device.setdefault("configuration_url", None)
+                    device.setdefault("disabled_by", None)
                     try:
-                        device["entry_type"] = DeviceEntryType(device.get("entry_type"))
+                        device["entry_type"] = DeviceEntryType(device.get("entry_type"))  # type: ignore[arg-type]
                     except ValueError:
                         device["entry_type"] = None
-
-                    # Introduced in 0.79
-                    # renamed in 0.95
-                    device["via_device_id"] = device.get("via_device_id") or device.get(
-                        "hub_device_id"
-                    )
-                    # Introduced in 0.87
-                    device["area_id"] = device.get("area_id")
-                    device["name_by_user"] = device.get("name_by_user")
-                    # Introduced in 0.119
-                    device["disabled_by"] = device.get("disabled_by")
-                    # Introduced in 2021.11
-                    device["configuration_url"] = device.get("configuration_url")
-                # Introduced in 0.111
-                old_data["deleted_devices"] = old_data.get("deleted_devices", [])
+                    device.setdefault("name_by_user", None)
+                    # via_device_id was originally introduced as hub_device_id
+                    device.setdefault("via_device_id", device.get("hub_device_id"))
+                old_data.setdefault("deleted_devices", [])
                 for device in old_data["deleted_devices"]:
-                    # Introduced in 2021.2
-                    device["orphaned_timestamp"] = device.get("orphaned_timestamp")
+                    device.setdefault("orphaned_timestamp", None)
             if old_minor_version < 3:
-                # Introduced in 2022.2
+                # Version 1.3 adds hw_version
                 for device in old_data["devices"]:
-                    device["hw_version"] = device.get("hw_version")
+                    device["hw_version"] = None
 
         if old_major_version > 1:
             raise NotImplementedError
diff --git a/homeassistant/helpers/entity_registry.py b/homeassistant/helpers/entity_registry.py
index ce0d260beb3..2325ccca786 100644
--- a/homeassistant/helpers/entity_registry.py
+++ b/homeassistant/helpers/entity_registry.py
@@ -172,32 +172,34 @@ class RegistryEntry:
         hass.states.async_set(self.entity_id, STATE_UNAVAILABLE, attrs)
 
 
-class EntityRegistryStore(storage.Store):
+class EntityRegistryStore(storage.Store[dict[str, list[dict[str, Any]]]]):
     """Store entity registry data."""
 
     async def _async_migrate_func(
-        self, old_major_version: int, old_minor_version: int, old_data: dict
+        self,
+        old_major_version: int,
+        old_minor_version: int,
+        old_data: dict[str, list[dict[str, Any]]],
     ) -> dict:
         """Migrate to the new version."""
         data = old_data
         if old_major_version == 1 and old_minor_version < 2:
-            # From version 1.1
+            # Version 1.2 implements migration and freezes the available keys
             for entity in data["entities"]:
-                # Populate all keys
-                entity["area_id"] = entity.get("area_id")
-                entity["capabilities"] = entity.get("capabilities") or {}
-                entity["config_entry_id"] = entity.get("config_entry_id")
-                entity["device_class"] = entity.get("device_class")
-                entity["device_id"] = entity.get("device_id")
-                entity["disabled_by"] = entity.get("disabled_by")
-                entity["entity_category"] = entity.get("entity_category")
-                entity["icon"] = entity.get("icon")
-                entity["name"] = entity.get("name")
-                entity["original_icon"] = entity.get("original_icon")
-                entity["original_name"] = entity.get("original_name")
-                entity["platform"] = entity["platform"]
-                entity["supported_features"] = entity.get("supported_features", 0)
-                entity["unit_of_measurement"] = entity.get("unit_of_measurement")
+                # Populate keys which were introduced before version 1.2
+                entity.setdefault("area_id", None)
+                entity.setdefault("capabilities", {})
+                entity.setdefault("config_entry_id", None)
+                entity.setdefault("device_class", None)
+                entity.setdefault("device_id", None)
+                entity.setdefault("disabled_by", None)
+                entity.setdefault("entity_category", None)
+                entity.setdefault("icon", None)
+                entity.setdefault("name", None)
+                entity.setdefault("original_icon", None)
+                entity.setdefault("original_name", None)
+                entity.setdefault("supported_features", 0)
+                entity.setdefault("unit_of_measurement", None)
 
         if old_major_version == 1 and old_minor_version < 3:
             # Version 1.3 adds original_device_class
@@ -238,7 +240,7 @@ class EntityRegistryStore(storage.Store):
         if old_major_version == 1 and old_minor_version < 9:
             # Version 1.9 adds translation_key
             for entity in data["entities"]:
-                entity["translation_key"] = entity.get("translation_key")
+                entity["translation_key"] = None
 
         if old_major_version > 1:
             raise NotImplementedError