Hello. So basically the problem is in image tracking. If you quickly remove the marker, the spawned object will anyway remain on the place where marker was. And its statet will be Tracking. Not Limited or None. Sure if i will move phone object may dissapear. But why its state remains as Tracking even if there is no marker at all? Thank you.
Hello there! Could you file a bug report for us so that our QA team can look into this? https://unity3d.com/unity/qa/bug-reporting.