I notice that when building my apps, the same 72×72 app icon is saved for both iOS and Android depending on which one one was last used in the build for that app. For example, after building in iOS, the 72×72 iOS icon will be the preset in the Android build. After uploading the correct icon for Android and rebuilding, the 72×72 Android icon will now show up as the preset for the iOS build.
Hopefully that makes sense….