Sixel implementation not working in WinGet 1.9.2507

[denelon]

Brief description of your issue

Sixel images not rendered.

Steps to reproduce

Add the following to WinGet settings:

    "visual": {
        "progressBar": "sixel", 
        "enableSixels": true
    }

Expected behavior

Sixel images are rendered in winget --info and in the output from help.
Icons rendered for packages using winget show <package>
Sixel style progress output.

Actual behavior

Default WinGet progress output.

Environment

Windows Package Manager v1.9.2507
Copyright (c) Microsoft Corporation. All rights reserved.

Windows: Windows.Desktop v10.0.26100.2023
System Architecture: Arm64
Package: Microsoft.DesktopAppInstaller v1.24.2507.0