This is a Unity's compatibility issue among few we met. We have a Chinese version of how-to-fix right now: https://www.easyar.cn/view/questionDetails.html#163
We provide an official solution to this issue because it also involves very recent releases. Same thing will NOT happen in almost every other issues, including critical issues like unable to publish to store if there were any in future.
Version 3 is NOT supported anymore, make sure to use latest release whenever possible. We will always provide bug fix in new releases.