This issue also occurs in iOS 26.2 beta 😭. So I filed a feedback report as you said. (ID: FB20962776)

So, should we assume that even if the user doesn't explicitly close the app, the system can disconnect a scene to reclaim memory (where only the Scene is disconnected but the rest of the process's state is preserved), and when the user re-enters the app later, the Scene passed to willConnectTo is always a completely new Scene, not the previously disconnected one?

I understand. Thank you!