[iOS] Popping a page includes an unexpected page in the NavigationStack when the underlying page's OnAppearing method is called

[MitchBomcanhao]

Description

I've tested this on iOS, Android and Windows.
on iOS only, the NavigationStack still contains the page you've just popped in the navigation stack when the underlying page's OnAppearing method is triggered. this is causing failures in our existing code as this used to work fine on xamarin forms. I've tried this back to dotnet maui 9.0.0 and it still fails in the same way.

Steps to Reproduce

Prerequisites

1. create a basic app with 3 pages (FirstPage, SecondPage, ThirdPage), not using shell. set the main page as a NavigationPage with FirstPage.
2. on FirstPage add a button to navigate to SecondPage
3. on SecondPage add a button to navigate to ThirdPage
4. on SecondPage add an override to OnAppearing, where you can check the navigation stack.

Repro steps:

1. Launch the app
2. tap the button to navigate to SecondPage
3. tap the button to navigate to ThirdPage
4. tap the back button on the top left of the screen, to take you back to SecondPage
5. OBSERVE

• on iOS: the NavigationStack will have 3 pages, with the last one being ThirdPage when inspected inside the OnAppearing method of the SecondPage. it should only have 2 pages.
• on Android and Windows: NavigationStack only has 2 pages, with the last one being SecondPage, as expected

iOS:

Android

Windows

Link to public reproduction project repository

https://github.com/MitchBomcanhao/maui28414

Version with bug

9.0.50 SR5

Is this a regression from previous behavior?

Yes, this used to work in Xamarin.Forms

Last version that worked well

Unknown/Other

Affected platforms

iOS

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

[MitchBomcanhao]

@StephaneDelcroix: added https://github.com/MitchBomcanhao/maui28414

[praveenkumarkarunanithi]

This issue has been verified in Visual Studio Code 1.98.2 (9.0.50). It can be reproduced on iOS 18.2 (iPhone 12 and iPhone 16) and macOS. The issue does not reproduce on Android and Windows.