You should only need one icon, nothing else.
Like this:
Out of interest you can always look into the json, but the json file should only reference the same as you see in xcode really. Otherwise something is corrupt.
If you see any other image or icon anywhere, it means that image is included in your project, so you should be able to find that image when you browse in your folders in Finder.
Thanks, I think I have the same as on your image. However that one icon is still default and I can't find where it come from..
The rest icons looks good, so it's a very good news that no needed to create a ton of icons, just need to figure out with this one..