diff --git a/lib/app/app_controller_desktop_thread_actions.dart b/lib/app/app_controller_desktop_thread_actions.dart
index d2b051b6..f92e7a06 100644
--- a/lib/app/app_controller_desktop_thread_actions.dart
+++ b/lib/app/app_controller_desktop_thread_actions.dart
@@ -210,7 +210,6 @@ extension AppControllerDesktopThreadActions on AppController {
       nextSessionKey,
       executionTarget: nextTarget,
       messageViewMode: nextViewMode,
-      updatedAtMs: DateTime.now().millisecondsSinceEpoch.toDouble(),
     );
     await ensureDesktopTaskThreadBindingInternal(
       nextSessionKey,
diff --git a/test/runtime/assistant_execution_target_test.dart b/test/runtime/assistant_execution_target_test.dart
index 929b1062..929a7fee 100644
--- a/test/runtime/assistant_execution_target_test.dart
+++ b/test/runtime/assistant_execution_target_test.dart
@@ -348,6 +348,54 @@ void main() {
       expect(keys, isNot(contains('session-1')));
     });
 
+    test(
+      'switching sessions does not refresh task ordering timestamp',
+      () async {
+        final localHome = await Directory.systemTemp.createTemp(
+          'xworkmate-stable-task-selection-home-',
+        );
+        addTearDown(() async {
+          if (await localHome.exists()) {
+            await localHome.delete(recursive: true);
+          }
+        });
+        final controller = AppController(
+          environmentOverride: const <String, String>{},
+        );
+        addTearDown(controller.dispose);
+        controller.resolvedUserHomeDirectoryInternal = localHome.path;
+
+        const newerTask = 'draft:newer-task';
+        const olderTask = 'draft:older-task';
+        const newerUpdatedAtMs = 2000.0;
+        const olderUpdatedAtMs = 1000.0;
+        controller.upsertTaskThreadInternal(
+          newerTask,
+          executionTarget: AssistantExecutionTarget.gateway,
+          messageViewMode: AssistantMessageViewMode.rendered,
+          updatedAtMs: newerUpdatedAtMs,
+        );
+        controller.upsertTaskThreadInternal(
+          olderTask,
+          executionTarget: AssistantExecutionTarget.gateway,
+          messageViewMode: AssistantMessageViewMode.rendered,
+          updatedAtMs: olderUpdatedAtMs,
+        );
+
+        await controller.switchSession(olderTask);
+
+        expect(controller.currentSessionKey, olderTask);
+        expect(
+          controller.requireTaskThreadForSessionInternal(olderTask).updatedAtMs,
+          olderUpdatedAtMs,
+        );
+        expect(
+          controller.assistantSessions.map((item) => item.key).take(2),
+          <String>[newerTask, olderTask],
+        );
+      },
+    );
+
     test(
       'returns unspecified when a saved provider is no longer in the current catalog',
       () {