[Problem]: UWP App Package for Desktop/Xbox fails Store Certification with Fixed Runtime included

What happened?

We're building a UWP application with a Fixed Version runtime of WebView2.

The built app bundle fails store certification with the Windows App Certification Kit 10.0.22621.2428 due to use of prohibited APIs by the WebView2 runtime.

[!NOTE]
It succeeds when adding the runFullTrust capability but for the simple reason that the 'Supported API Test' is excluded in that case. The APP is meant to be published to the Store for Windows and Xbox, so that's not an option afaiu.

Assets

UWP Store Build

• Package build: https://github.com/softworkz/WebViewDeployment/tree/master/MsixBundles/MSIX_UWP_Default
• Test Report: https://github.com/softworkz/WebViewDeployment/blob/master/MsixBundles/MSIX_UWP_Default/Windows%20App%20Certification%20Kit%20-%20Test%20Results.htm

UWP Build with runFullTrust

• Package build: https://github.com/softworkz/WebViewDeployment/tree/master/MsixBundles/MSIX_UWP_FullTrust
• Test Report: https://github.com/softworkz/WebViewDeployment/blob/master/MsixBundles/MSIX_UWP_FullTrust/Windows%20App%20Certification%20Kit%20-%20Test%20Results.html

Importance

Blocking. My app's basic functions are not working due to this issue.

Runtime Channel

Stable release (WebView2 Runtime)

Runtime Version

119.0.2151.58

SDK Version

1.0.1823.32

Framework

WinUI2/UWP

Operating System

Windows 10, Windows 11, Xbox

OS Version

22621.2506

Repro steps

• Clone this repo: https://github.com/softworkz/WebViewDeployment
  This is the original Xbox sample with a few changes to get it ready for store publishing.
• Build in Release config and create a package
• Run the generated package in the Windows App Certification Toolkit
• Watch the results

For comparison with runFullTrust:

• Just revert the latest commit or reset to one commit below
• Same steps as above

Ready-built packages and test report are included in the repo in folder ./MsixBundles

Start with the WebViewDeployment repository and compare the MSIX_UWP_Default and MSIX_UWP_FullTrust packages and their Windows App Certification Kit reports in ./MsixBundles. Reproduce the Release package build and certification test; done requires the cause of the prohibited API failures to be established and the intended package to pass certification without relying on runFullTrust.