Zip archive fails to parse on portable package update

Brief description of your issue

I'm trying to update the Martchus.syncthingtray package, but after the selection of the new "installer", I get "Failed to parse the package from". This is a package that's marked as a portable installer, and the zip file that gets downloaded contains the new exe

Steps to reproduce

1. Run wingetcreate update Martchus.syncthingtray -i -v 1.4.8
2. Enter https://github.com/Martchus/syncthingtray/releases/download/v1.4.8/syncthingtray-1.4.8-x86_64-w64-mingw32.exe.zip as new URL
3. Select syncthingtray-1.4.8-x86_64-w64-mingw32.exe as the new installer

Expected behavior

Package parses correctly and lets me continue with updating the package

Actual behavior

Failed to parse the package from [https://github.com/Martchus/syncthingtray/releases/download/v1.4.8/syncthingtray-1.4.8-x86_64-w64-mingw32.exe.zip]

Log file:
WingetCreateLog-2023-11-20-17-14.342.txt

Environment

Windows-Paket-Manager Manifest Creator v1.5.7.0

Windows-Paket-Manager (Vorschau) v1.7.2782-preview
Copyright (c) Microsoft Corporation. Alle Rechte vorbehalten.

Windows: Windows.Desktop v10.0.22631.2715
Systemarchitektur: X64
Paket: Microsoft.DesktopAppInstaller v1.22.2782.0

No source file or test is named. Start by reproducing the failure with wingetcreate update and inspect the linked WingetCreateLog file, then trace the portable-installer package parsing entry point. Done means the specified ZIP and executable parse successfully and the package update can continue.