The apps will disappear from your account if you change device/reset or update your device. Also, if you have accidentally hidden it.
Having said that, the games/apps must get confirmed on the account in order for you you earn bonuses. If any app is not confirmed then they will automatically disappear from your profile after earning 3 days of usage points.
If you are still facing any other issues then please reach out to us through the in-app support.