When I am taking a video with the back camera of my iPhone 13 ProMax and I drag my finger across the zoom, as the zoom moves from 0.5 to 1.0 there is an obvious jarring hiccup as the cameras change. When I continue to zoom from 1.0 through 3.0, the video hiccups again and the lighting is processed (it usually looks cooler) by the third camera. It has not been possible to smoothly zoom through the different cameras.
I reset my iPhone to factory specifications and set it up again without setting up the iCloud. I had the same results with the choppy video.
A senior advisor wasn't able to diagnose/solve the issue but admitted the video quality was not as expected. Apple shipped a replacement phone. When I opened the new phone, I had the same issue. I have owned other iPhones and have not experienced the issue to this degree.
My phone is a 13 Pro Max with 1 TB of storage, running the latest iOS.
I posted this question in the iPhone support community.