diff --git a/mobile/lib/domain/models/asset/remote_asset.model.dart b/mobile/lib/domain/models/asset/remote_asset.model.dart
index 22648dac0f..36dc6242e1 100644
--- a/mobile/lib/domain/models/asset/remote_asset.model.dart
+++ b/mobile/lib/domain/models/asset/remote_asset.model.dart
@@ -81,10 +81,15 @@ class RemoteAsset extends BaseAsset {
         stackId == other.stackId;
   }
 
-  // Mirrors `==` above, which deliberately does not compare localId.
   @override
   int get hashCode =>
-      super.hashCode ^ id.hashCode ^ ownerId.hashCode ^ thumbHash.hashCode ^ visibility.hashCode ^ stackId.hashCode;
+      super.hashCode ^
+      id.hashCode ^
+      ownerId.hashCode ^
+      localId.hashCode ^
+      thumbHash.hashCode ^
+      visibility.hashCode ^
+      stackId.hashCode;
 
   RemoteAsset copyWith({
     String? id,
diff --git a/mobile/lib/presentation/widgets/timeline/fixed/segment.model.dart b/mobile/lib/presentation/widgets/timeline/fixed/segment.model.dart
index aa2112b8dd..32a2db58a2 100644
--- a/mobile/lib/presentation/widgets/timeline/fixed/segment.model.dart
+++ b/mobile/lib/presentation/widgets/timeline/fixed/segment.model.dart
@@ -234,7 +234,11 @@ class _AssetTileWidget extends ConsumerWidget {
       return false;
     }
 
-    return lockSelectionAssets.contains(asset);
+    // Iterate with `==` instead of `Set.contains` because `RemoteAsset.hashCode`
+    // includes `localId` while `==` does not — so the same server asset can
+    // hash to a different bucket when its `localId` differs (e.g., album-fetched
+    // copy has localId=null, merged-timeline copy has it populated).
+    return lockSelectionAssets.any((a) => a == asset);
   }
 
   @override