Undo system app mover but app doesn't show on the list

Hi everyone!

I have used system app mover to make an app a system app.
Although the app disappeared, I just reinstalled it from the Google Play Store and the app works as a system app.

However, I would now like to undo my operation and move back the app to be a non-system app but the app doesn't appear in the list insie /system/app/ mover's app even if the option to show system apps is checked.

How can I remove the app from the system apps?

Thanks :)