As you can see in the video, the app icon still has the default cordova icon when transitioning to the home screen and when viewing multi-tasking. I replaced all the default cordova icons with my custom app icon and even replaced all the necessary launch images and launch storyboard image. I also replaced the icons in the icons folder in Construct 3. It's completely fine on android, just iOS has issues.
If anyone knows a fix or has had similar issues, please share. It would help a lot.