Seems to be related to DocumentGroupLaunchScene. If I take that scene out entirely of their demo app, and just leave the DocumentGroup scene, the issue doesn't present. Happens in both iPhone and iPad simulators. I see a lot of console log noise with NSLayoutConstraint warnings. That seems like a hint here. Apple needs to issue a fix it seems. Xcode 16.1 / iOS 18.1

This appears fixed in the Xcode 16 GM. Anecdotally, I can no longer reproduce the issue now with it. The issue had been moved to Resolved Issues in the release notes: https://developer.apple.com/documentation/xcode-release-notes/xcode-16-release-notes#Foundation

It appears the preview titlebar rendering may be incorrect / buggy. As a test, I put a rectangle in the inspector and it is consistent with the runtime behavior of filling only the under-titlebar area. It just seems like the preview is incorrectly rendering the titlebar as full-height, but the preview is not actually a full-height inspector. struct ContentView: View { var body: some View { VStack { Image(systemName: "globe") .imageScale(.large) .foregroundStyle(.tint) Text("Hello, world!") } .padding() .toolbar { Text("test") } .inspector(isPresented: .constant(true)) { Rectangle().fill(.red) } } } Preview: Runtime:

I can reproduce this. Issue only occurs on-device with iOS 17 beta 6. Works fine in a simulator. I believe it's an internal bug in AVAssetExportSession. I've submitted a radar to Apple (FB12986599) with detailed info and an example Xcode project to reproduce the issue.