Reproduction steps:
1. Open the attached "Archive" project.
2. Go to "Player settings > Splash Image > Launch Screen".
3. Check the selected image.
4. Build and run for iOS.

Actual result:
- Launch screen is a white box("Actual" screenshot).

Expected result:
- Image is the same as shown in the editor("Editor" screenshot).
or
- Some type of warning is shown in the editor when selecting an image with alpha. Image in the launch screen selection box is shown as a white box too.

Reproduced with:
5.3.7f1,
5.4.2p3,
5.5.0b11,
5.6.0a2,
iPad Air 2 9.3.2