In privileged mode, usage stats permission is used by default which might cause issues in a few devices due to bad implementation. There’s a way to disable the feature without opening App Manager’s main page:
- Install App Manager, but do not open it
- Open App Info page of App Manager in Android Settings app
- Click on Additional settings in the app (you may have to click on Advanced before that). This will open the settings page of App Manager.
- Navigate to Appearance > Enable/disable features and then uncheck Usage access.