back button history with `NavigationSplitView` can include ghost entries

Hi! When using nested NavigationSplitViews including an uncollapsed NavigationSplitView the automatically generated back button in the header bar has ghost entries in its history. In the attached example the back button history includes an entry for "page0" which corresponds to the whole NavigationSplitView embedded into a NavigationPage. Clicking on this entry wont have any effect. I think this entry shouldn't be there in the first place. Interestingly this is exactly the case when the NavigationSplitView is collapsed.