`winget upgrade oh-my-posh --version 27.1.2` installs a second copy of the app instead of upgrading it

Relevant area(s)

WinGet CLI

Relevant command(s)

winget upgrade

Brief description of your issue

Context:

JanDeDobbeleer.OhMyPosh version 26.23.8 was installed machine-wide using an MSI, and my machines are configured to install machine-wide by default:

    "installBehavior": {
        "preferences": {
            "scope": "machine",
            "architectures": ["x64"]
        }
    }

Version 27.1.2's manifest specifies that MSIX installation is preferred, and this only supports per-user installation.

The problem:

Running winget upgrade oh-my-posh --version 27.1.2 on a machine with 26.23.8 installed machine-wide doesn't upgrade the existing app, but instead installs a second copy.

The result is:

PS❯ winget list JanDeDobbeleer.OhMyPosh
Name       Id                      Version Source
--------------------------------------------------
Oh My Posh JanDeDobbeleer.OhMyPosh 27.1.2  winget
Oh My Posh JanDeDobbeleer.OhMyPosh 26.23.8 winget
PS❯ gcm oh-my-posh -all

CommandType     Name                                               Version    Source
-----------     ----                                               -------    ------
Application     oh-my-posh.exe                                     26.23.8.0  C:\Program Files (x86)\oh-my-posh\bin\oh-my-posh.exe
Application     oh-my-posh.exe                                     27.1.2.0   C:\Users\<REDACTED>\AppData\Local\Programs\oh-my-posh\bin\oh-my-posh.exe

Steps to reproduce

1. Install JanDeDobbeleer.OhMyPosh version 26.23.8 machine-wide
2. Run winget upgrade oh-my-posh --version 27.1.2

Expected behavior

Version 27.1.2 should replace version 26.23.8

Actual behavior

Version 27.1.2 is installed per-user next to version 26.23.8. And the latter is first on the PATH, so the new version isn't used.

Environment


Windows Package Manager v1.11.430
Copyright (c) Microsoft Corporation. All rights reserved.

Windows: Windows.Desktop v10.0.19045.6396
System Architecture: X64
Package: Microsoft.DesktopAppInstaller v1.26.430.0

Winget Directories
-------------------------------------------------------------------------------------------------------------------------------
Logs                               %LOCALAPPDATA%\Packages\Microsoft.DesktopAppInstaller_8wekyb3d8bbwe\LocalState\DiagOutputDir
User Settings                      %LOCALAPPDATA%\Packages\Microsoft.DesktopAppInstaller_8wekyb3d8bbwe\LocalState\settings.json
Portable Links Directory (User)    %LOCALAPPDATA%\Microsoft\WinGet\Links
Portable Links Directory (Machine) C:\Program Files\WinGet\Links
Portable Package Root (User)       %LOCALAPPDATA%\Microsoft\WinGet\Packages
Portable Package Root              C:\Program Files\WinGet\Packages
Portable Package Root (x86)        C:\Program Files (x86)\WinGet\Packages
Installer Downloads                %USERPROFILE%\Downloads
Configuration Modules              %LOCALAPPDATA%\Microsoft\WinGet\Configuration\Modules

Links
---------------------------------------------------------------------------
Privacy Statement   https://aka.ms/winget-privacy
License Agreement   https://aka.ms/winget-license
Third Party Notices https://aka.ms/winget-3rdPartyNotice
Homepage            https://aka.ms/winget
Windows Store Terms https://www.microsoft.com/en-us/storedocs/terms-of-sale

Admin Setting                             State
--------------------------------------------------
LocalManifestFiles                        Disabled
BypassCertificatePinningForMicrosoftStore Disabled
InstallerHashOverride                     Disabled
LocalArchiveMalwareScanOverride           Disabled
ProxyCommandLineOptions                   Disabled
DefaultProxy                              Disabled

Start by reproducing the machine-wide MSI and per-user MSIX upgrade scenario with the listed winget commands, then trace the upgrade path that selects installer scope. Done means upgrading the existing machine-wide installation without leaving a second per-user copy, with regression coverage for this scope mismatch.