Strange Problem with AppleTV icon - icon shrinks when selected on 4K models?

In a basic AppleTV app.

ON 4K models.

When you roll over the icon, the iml becomes 1/2 size and sits top right, and the rest of the icon area is just gray.

Has anyone seen this behavior?

Same build works perfectly on pre-4K AppleTV models.

Have endlessly checked that all the image assets are correct. This on Xcode 13.4.

The actual parallax nonsense works perfectly - but with the icon sitting in the top quarter only of the icon area!

After hours, here's the solution which is totally undocumented.

The three (or two) 1x images:

• Should be 400.240 (in fact, causes no problems if size is wrong)

The three (or two) 2x images:

• MUST be strictly 800.480 or will fail catastrophically and silently on 4K models

Depressingly, SOME of the images in the asset folder, include working and correct alerts, for example:

However the actual "App Icon" slots DO NOT HAVE any working alerts.

Bottom line, MUST be exactly 800.480.

The "Top Shelf" images are:

1920.720 and 3840.1440

The "Top Shelf Wide" images are:

2320.720 and 4640.1440