Can you tell us what make and model of the Android device? And the version of Android?
We also have a newer version of AppStudio, version 4.2.x, with Qt version 5.13.1, that might have fixed this.
We have tested on the following:
Huawei Y5, Android 8.1.0
Galaxy J7, Android 8.1.0
Sony Experia XZ Prime, Android 9
QT Version: 5.12.3
Thanks for your feedback,