Macrumors notes that the screen on some iPhone 14 Pro and iPhone 14 Pro Max displays horizontal lines at startup.
The lines are green or yellow and are visible for a few seconds before disappearing.
According to Apple’s support, it should not be a problem with the hardware itself, so hopefully it can be fixed in a future update of IOS 16.
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Right now, IOS 16.3 is being fully beta tested and the final version will be released in January or February.