Hi Michael, Thanks for confirming the behavior on the TestFlight build. You're right that from a robustness standpoint our app already handles ImmersiveSpace dismissal gracefully, we handle the Digital Crown case and the state sync. So in that sense, no workaround is strictly needed to avoid a broken state. However, I'd like to flag that the graceful-dismissal path isn't really the concern here. My expectation for "Lock In Place" is that it behaves like it does for regular windows, the window gets pinned to a world anchor and stays put, while the rest of the scene (including the ImmersiveSpace and its content) continues as-is. "Follow Me" already works this way and doesn't tear down the ImmersiveSpace, so the asymmetry feels unintentional. The fact that it only reproduces on TestFlight/Release builds and not on Debug also suggests this isn't by design. So while I agree the app-side handling is fine, I'd push back that the ImmersiveSpace being dismissed as a side effect of locking a window is itself the bug, not just something to handle. Could you confirm whether the dismissal behavior is intended, or whether FB22290781 will stay open as an OS-level issue? I'd like to make sure it doesn't get closed as "works as designed," because from a user-experience perspective, Lock In Place tearing down immersive content is surprising and inconsistent with Follow Me. Happy to provide anything else that would help the investigation. Thanks, Kunal

Hi Michael, As requested, I updated the sample app to use ToggleImmersiveSpaceButton instead of a manual open/close button. I rebuilt the app, distributed it via TestFlight, and reproduced the issue on Apple Vision Pro. The issue still occurs consistently. Attachments: Screen recording demonstrating the issue - TestFlight distributed Build. Sysdiagnose captured after reproduction of the issue. Updated sample project. Steps to reproduce: Archive and upload a build to TestFlight. Install the application via TestFlight. Tap "Show Immersive Space". Lock the window. Tap "Hide Immersive Space". Tap "Show Immersive Space". The red cube is missing and even immersive space and window disappears for a brief moment and then appears. Device: Apple Vision Pro visionOS 26.0 Xcode: Version 26.3

Hi Michael, Thank you for looking into this. To clarify, this issue is not reproducible when running locally (Debug or Release). It only occurs in TestFlight distribution builds. In our production app as well as the minimal sample project, the behavior is consistent — the bug only appears when installed via TestFlight, not when run directly from Xcode. Regarding the video - at 0:31 you can see the cube briefly disappears after Lock In Place. That is the moment we are referring to. Could you please try the following: Archive the sample project Upload to TestFlight Install via TestFlight on the device Reproduce the Lock In Place steps I am confident it will be reproducible in that configuration. I am happy to provide another screen recording specifically showing this if that would help. Please let me know if you need anything else. Thanks, Kunal