It's just a hunch, but try checking that you have all the required icon sizes in Icons folder. Click on each file and make sure that it's set as "App icon". If you are using a loading logo or storyboard splash, add these images too and set their Purpose property correctly.
Yes they all have icons and they are all set as app icons. only the loading bar is also set correctly, it's like they're all right. But unfortunately I couldn't publish it as a debug apk again. What else can I do?