UnitConverter (user setting lost - Group separator setting value may get lost)

[functional-fuzzing-android-apps]

The bug was found in the latest release (version 5.5.1). The bug can be reproduced on an Android emulator 6.0 and a Google Pixel 3 XL phone.

Bug description:

• When I fresh start the app, by default it uses system language (English in my case), we can see the None option in Group Separator was initially selected.
• However, when I did some slight manipulations: (1) switch to another language, (2) select the None option in Group Separator, and (3) switch back to English or any other language. We can see wierd G symbols in the numbers, and we can also see the "None" option was unselected (lost). Note that this issue cannot be manifested without step (2).

Reproducing Video