Expo React-Native isn't changing Android Adaptive Icon

With Androids adaptive Icon, there is a white circle with the colored Icon foreground in the middle of it. The expo instructions to change the color are to set the android.adaptiveIcon.foregroundImage & backgroundColor in the app.json of the project, which I've done:

"android": {
      "adaptiveIcon": {
        "foregroundImage": "./assets/images/icon.png",
        "backgroundColor": "#2196f3"
      },
      ...
    }

But when I rebuild and upload to the google play store, the launcher icon is still inside of a white circle instead of #2196f3 blue circle that I want.