When using a NavigationSplitView in a DocumentGroup, SwiftUI renders incorrect UI and doesn’t let the user navigation between the sidebar and detail views. Even the default Xcode project template “Document App” doesn’t work.
Steps to reproduce
- Create a new project and use the Document App template.
- Run the project on either iPad or iPhone running iOS 26 beta 9
- Experience the following issues.
On iPhone
- The back button (to return to the document browser) and the document title are rendered two times.
- When viewing the detail of an item, by navigating to the detail view, you cannot go back to the list of items, because the back button brings you back to the document browser.
The same issues are also present on iPad.
I've tested this on an iPad and iPhone running iOS 26 beta 9 and Xcode 26.0 beta 7.
I've reported this issue already → FB20062294