MSIX build tools package only creates single-architecture msixupload file

[wjk]

Describe the bug

When I downloaded the *.msixupload file attached to my app’s release on GitHub (built by GitHub Actions), I noticed it was smaller than it should be. Inspection of the downloaded zipfile reveals the upload contains only the following files:

• MSIExtract_3.1.0.0_x64.msix
• MSIExtract_3.1.0.0_x64.appxsym

The ARM64 build and the MSIExtract-3.1.0.0_scale-* packages containing assets are missing. These files are present in the *.msixbundle file built by the same workflow.

Steps to reproduce the bug

Look at this release of my program. The files attached to the release were built by this GitHub Actions workflow.

Expected behavior

The *.msixupload file should contain the ARM64 build as well as its appxsym, along with the scaled asset packages.

Screenshots

N/A

NuGet package version

1.7.260501103

Packaging type

Packaged (MSIX)

Windows version

Insider Build (xxxxx)

IDE

Other

Additional context

I am not in the Insider program per se, but winver reports I am on 25H2 build 26200.8037, which is not in the Windows version dropdown.