Even though I set the icon in AppIcon like this, when I check it with a simulator or an actual machine test, about the solution when the icon image does not change as the initial image I checked it and restarted it, deleted the app and reinstalled it, and Clean Build Folder did not solve the problem.
Click Assets.xcassets → Click App Icon and click Check the top part of Target Membership in this image to change it. If the check here is unchecked, it seems that it will be the initial image.
If you have any other solutions or suggestions for similar cases, please feel free to comment!