Hello
i installed GOS around a month ago and whatsapp via the APK provided on their site.
at first i would hear a notification when receiving a WA message,but now i need to unlock the phone in order to see on the app icon, the number of missed messages.
sometimes i also need to open the app in order to receive those messages.
my OS is mostly stock,just Firefox and Whatsapp, both downloaded from their respective site.