Get-Module -ListAvailable doesn't respect DefaultPrefix

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest released version
• Search the existing issues.
• Refer to the FAQ.
• Refer to Differences between Windows PowerShell 5.1 and PowerShell.

Steps to reproduce

Use any module that has the DefaultCommandPrefix defined in the module manifest. I modified one of my modules to test with.

In Windows PowerShell, if I have a module that uses a defined prefix, this works as expected.

Expected behavior

PS C:\> $mod = Get-Module PSChristmas -ListAvailable
PS C:\> $mod.ExportedFunctions.keys
New-xElfName
Get-xPSChristmasPresent
New-xPSChristmasGreeting
New-xPSChristmas
Show-xPSChristmasMessage
Invoke-xJingle
Write-xFestive

The module is NOT loaded into my session. But not in PowerShell 7. PowerShell 7 fails to use the prefix.

Actual behavior

PS C:\> $mod = Get-Module PSChristmas -ListAvailable
PS C:\> $mod.ExportedFunctions.keys
New-ElfName
Get-PSChristmasPresent
New-PSChristmasGreeting
New-PSChristmas
Show-PSChristmasMessage
Invoke-Jingle
Write-Festive

If I import the module in PowerShell 7 and re-run the command then it works.

PS C:\> import-module pschristmas
PS C:\> $mod = Get-Module PSChristmas
PS C:\> $mod.ExportedFunctions.keys
Get-xPSChristmasPresent
Invoke-xJingle
New-xElfName
New-xPSChristmas
New-xPSChristmasGreeting
Show-xPSChristmasMessage
Write-xFestive 

Environment data

Name                           Value
----                           -----
PSVersion                      7.1.3
PSEdition                      Core
GitCommitId                    7.1.3
OS                             Microsoft Windows 10.0.19043
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Also tested in 7.2.0-preview.4 with the same results.

DefaultCommandPrefix を定義するモジュールマニフェストで問題を再現し、その後、Get-Module -ListAvailable と Import-Module 後の動作を比較します。list-available パスでエクスポートされた関数がどのように設定されるかを追跡します。モジュールがインポートされる前に、一覧表示されたエクスポート関数名にマニフェストのプレフィックスが含まれていれば完了です。