Google Cardboard on iOS problem

Hello! I have this project with Google Cardboard built on a scene, but it actually starts on another scene without Cardboard support, it's just some UI elements. Today I managed (after two weeks of trial and error thanks to Apple's "simplicity") to run a test build on an iPhone XR and it started on the home screen of my app, but running stereo vision as if I was using the Cardboard in that very scene. Obviously the camera didn't move because there was no support for it and it wasn't built to start Cardboard right away. What could be the issue? Thank you for future responses.