I'm seeing the same issue. The field of view reported on my iPhone 15 Pro (non max) is 41.2. This is throwing off my app's calculations when it provides a framing guide (as suggested in the WWDC 2021 talk "What's new in Camera Capture" https://developer.apple.com/videos/play/wwdc2021/10047/).
Based on a little trigonometry, the error we're seeing here is consistent with what you'd expect if the sensor was twice the size in both dimensions. So I think the bug does have something to do with the pixel doubling in the 48 megapixel sensor. I hope Apple can release a fix for this soon. For now I've added a workaround that subtitles a hard coded value for videoFieldOfView when running on an iPhone 14 Pro model.
film shooter
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