It passed this morning.
(Also, I checked the behavior after installing 17.3 on the device. No change.)
erkyrath
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Well, it's nice to have a new friend, in the xkcd-2881 sense. :)
My app is also ObjC (as you can tell from the fact that it dates from 2016!) I doubt that has any effect on how the app icon is treated, anyhow.
tvOS 17.3 release notes (https://feedbackassistant.apple.com/news/7213) make no mention of this.
I guess I will file a bug report, I mean a Feedback, and then submit the app as is.