Narrator does not read out the NavigationView button after activating close/open NavigationView button in WPF Xaml Islands

[arjunbalgovind]

Describe the bug

If the user has tab focus on the Open/Close NavigationView button, the Narrator will initially read out "Close Navigation..." and after pressing Enter on it, the NavigationView closes but it does not read out the new name "Open Navigation...". On all examples of NavigationView on the Xaml Controls Gallery app, this behavior does not happen. The button is read out by the narrator whenever it is activated.

Steps to reproduce the bug

Steps to reproduce the behavior:
It can be reproduced on the WPF Xaml Islands Sample by modifying this to Left:
https://github.com/microsoft/Xaml-Islands-Samples/blob/4889c827866adfc9ef95a675384cebe998cc28ce/Samples/Managed/UWPApplication/MainPage.xaml#L22

1. Go to Open/Close NavigationView button with Narrator switched on
2. Press Enter to activate the button

Expected behavior

Narrator should read out the name of the button before and after pressing Enter to notify the user that an event has taken place.

Screenshots

The bug can be reproduced on PowerToys (which uses a WPF Xaml Islands). The issue microsoft/PowerToys#7024 has a video of the repro.
Version Info

NuGet package version:

Microsoft.UI.Xaml 2.5.0-prerelease.200923002

Windows app type:

UWP	Win32
Yes

WPF Xaml Island

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
May 2020 Update (19041)	Yes
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes
Xbox
Surface Hub
IoT

Additional context

The bug can be reproduced on PowerToys Settings (which uses a WPF Xaml Islands). The tracking issue is microsoft/PowerToys#7024

[ranjeshj]

This seems to be specific to being inside an island. I can see that Xaml Controls Gallery works as expected.

[chrisglein]

Looks like Ranjesh has confirmed that this doesn't repro outside of an islands context, so it doesn't seem to be an issue with that control. Not sure how this is influenced by being in an island. @Austin-Lamb what's your take on what would be different here?

[github-actions]

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