If the anchor picture is out of the camera view, the AR experience disappears. Both with USDZ files, created with Reality composer, directly opened on iPhone or iPad (with AR Quick Look), or with Adobe Aero. So I suppose the bug is due to ARKit.
At this time, there is no bug in Reality Composer for iOS (virtual data is still on the screen even if the real anchor picture is not on the screen/camera) but if you try to see your project with AR Quick Look, it does not work. Virtual data return to default coordinates (relative to camera) instead of real-relative coordinates.
Is there someone here ? Nobody answered to my problem. 🥲
