Embedded portal back navigation intermittently prompts sign-in (every second back press)

In the embedded web portal, navigating from the feedback module (default /) to the Help Center and then using the browser’s Back button alternates between working and showing a Sign in prompt - i.e., every second back navigation triggers an unexpected sign-in modal. Reported on macOS with Chrome.

Repro:

1. Navigate to embedded view with / as default route (feedback module)
2. Go to help center
3. Use browser's back button to go back to feedback module
4. I'm still signed in and in the feedback module
5. I go to the help center again
6. Use browser's back button to go back to feedback module
7. Sign in promp appears