diff --git a/python_modules/dagster/dagster/_core/definitions/asset_graph_subset.py b/python_modules/dagster/dagster/_core/definitions/asset_graph_subset.py
index fefe14d8cedb1..c762ebe67b01f 100644
--- a/python_modules/dagster/dagster/_core/definitions/asset_graph_subset.py
+++ b/python_modules/dagster/dagster/_core/definitions/asset_graph_subset.py
@@ -1,7 +1,6 @@
 import operator
 from collections import defaultdict
 from datetime import datetime
-from functools import cached_property
 from typing import (
     AbstractSet,
     Any,
@@ -34,17 +33,15 @@
 
 class AssetGraphSubsetSerializer(NamedTupleSerializer):
     def before_pack(self, value: "AssetGraphSubset") -> "AssetGraphSubset":
-        converted_partitions_subsets_by_serialized_asset_key = {}
-        for k, v in value.partitions_subsets_by_serialized_asset_key.items():
+        converted_partitions_subsets_by_asset_key = {}
+        for k, v in value.partitions_subsets_by_asset_key.items():
             if isinstance(v, PartitionKeysTimeWindowPartitionsSubset):
-                converted_partitions_subsets_by_serialized_asset_key[
-                    k
-                ] = v.to_time_window_partitions_subset()
+                converted_partitions_subsets_by_asset_key[k] = v.to_time_window_partitions_subset()
             else:
-                converted_partitions_subsets_by_serialized_asset_key[k] = v
+                converted_partitions_subsets_by_asset_key[k] = v
 
         return value._replace(
-            partitions_subsets_by_serialized_asset_key=converted_partitions_subsets_by_serialized_asset_key
+            partitions_subsets_by_asset_key=converted_partitions_subsets_by_asset_key
         )
 
 
@@ -53,42 +50,22 @@ class AssetGraphSubset(
     NamedTuple(
         "_AssetGraphSubset",
         [
-            ("partitions_subsets_by_serialized_asset_key", Mapping[str, PartitionsSubset]),
+            ("partitions_subsets_by_asset_key", Mapping[AssetKey, PartitionsSubset]),
             ("non_partitioned_asset_keys", AbstractSet[AssetKey]),
         ],
     )
 ):
     def __new__(
         cls,
-        partitions_subsets_by_serialized_asset_key: Optional[Mapping[str, PartitionsSubset]] = None,
-        non_partitioned_asset_keys: Optional[AbstractSet[AssetKey]] = None,
         partitions_subsets_by_asset_key: Optional[Mapping[AssetKey, PartitionsSubset]] = None,
+        non_partitioned_asset_keys: Optional[AbstractSet[AssetKey]] = None,
     ):
-        check.invariant(
-            not (partitions_subsets_by_serialized_asset_key and partitions_subsets_by_asset_key),
-            "Cannot provide both partitions_subsets_by_serialized_asset_key and partitions_subsets_by_asset_key",
-        )
-
-        if partitions_subsets_by_asset_key:
-            partitions_subsets_by_serialized_asset_key = {
-                key.to_user_string(): value
-                for key, value in partitions_subsets_by_asset_key.items()
-            }
-
         return super(AssetGraphSubset, cls).__new__(
             cls,
-            partitions_subsets_by_serialized_asset_key=partitions_subsets_by_serialized_asset_key
-            or {},
+            partitions_subsets_by_asset_key=partitions_subsets_by_asset_key or {},
             non_partitioned_asset_keys=non_partitioned_asset_keys or set(),
         )
 
-    @cached_property
-    def partitions_subsets_by_asset_key(self) -> Mapping[AssetKey, PartitionsSubset]:
-        return {
-            AssetKey.from_user_string(key): value
-            for key, value in self.partitions_subsets_by_serialized_asset_key.items()
-        }
-
     @property
     def asset_keys(self) -> AbstractSet[AssetKey]:
         return {