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Created attachment 14549 [details]
This one is an interesting one.
Open up the App on a new Page in a NavigationPage.
From that page change the MainPage to a new NavigationPage with a default ContentPage then immediately navigate to another page.
Then from this TabbedPage navigate to a new page, then go back and it will crash.
Attached is a repro. Start it up.
Press Move (it will go to the TabbedPage)
Press Move Again (it will go to a ContentPage)
Then press Back * It will now crash with Element already a child of another element.
If you navigate to each page by letting each page load first and pressing a button on the page to move to the next one it all works ok.
To me it seems like because the OnAppearing() is not running or something is not running on page because it is just quickly added to the stack but never visible.
Fixed as of 188.8.131.5205