When using .searchable with placement: .toolbarPrincipal inside a NavigationStack, the search field is incorrectly placed at the bottom of the view instead of the principal position where ToolbarPlacement.principal normally resides. This is confirmed by testing: a ToolbarItem with placement: .principal containing Text("Title") gets pushed away when the .searchable modifier is added, yet the search field still appears at the bottom rather than taking over the principal location as documented.