Environment variables set in launchSettings.json are not used in Packaged app

Describe the bug

I want to use the Microsoft.Extensions.Hosting.Host.CreateDefaultBuilder() to host a WinUI application. This works fine and I store basic configuration in the appsettings.json.
However if I want to set the environment via an environment variable in the launchSettings.json as described here it does not work as the environment variables are not set when starting the packaged profile.

Steps to reproduce the bug

1. Create a blank WinUi 3 app in VS2022
2. alter the launchSettings.json to include some environment variables in the section for the "Package" profile.
   "Sample.Winui (Packaged)": { "commandName": "MsixPackage", "environmentVariables": { "DOTNET_ENVIRONMENT": "Development" } }
3. Add var temp = Environment.GetEnvironmentVariables() in the constructor of the App class
4. Set a breakpoint after the statement and review the contents of temp to look for the environment variable

Expected behavior

The environment variables should be set when running the packaged app from within visual studio.

Screenshots

No response

NuGet package version

Windows App SDK 1.3.0: 1.3.230331000

Packaging type

Packaged (MSIX)

Windows version

Windows 10 version 22H2 (19045, 2022 Update)

IDE

Visual Studio 2022

Additional context

No response

Reproduce the packaged WinUI app from Visual Studio using the launchSettings.json Package profile and inspect Environment.GetEnvironmentVariables() in the App constructor. Compare the packaged profile behavior with the expected DOTNET_ENVIRONMENT value; done means the configured environment variables are present when the packaged app starts.