PowerShell: Constrained Language Audit mode breaks az.resources

Prerequisites

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• Make sure you are able to repro it on the latest released version
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• Refer to Differences between Windows PowerShell 5.1 and PowerShell.

Steps to reproduce

Previously, in 7.3.9, I could use the Get-AzADGroup cmdlet from az.resources. This now fails in 7.4.0, logging the following warning to the event log, apparently due to Constrained Language mode. I have read the notes at https://learn.microsoft.com/en-us/powershell/scripting/learn/application-control?view=powershell-7.4#wdac-policy-enforcement but my understanding is that this is in warning-only mode, so not sure why this breaks.

Confirm 7.4.0 works fine where WDAC doesn’t get involved. In both cases, $ExecutionContext.SessionState.LanguageMode reads as “FullLanguage” but with WDAC, we get the below error.

Can also confirm that rolling back to 7.3.9, Get-AZADGroup works fine again.

Expected behavior

PS > get-azadgroup -displayname azurevirtualdesktop

DisplayName         Id                 MailNickname Description
-----------         --                 ------------ -----------
AzureVirtualDesktop 4b5fc7cb.....745ff 61b71d76-7   Azure Virtual Desktop users

Actual behavior

PowerShell 7.4.0
[Constrained Language AUDIT Mode : No Restrictions]
PS > ipmo az.resources

PS> get-azadgroup -DisplayName azurevirtualdesktop
ParentContainsErrorRecordException: ....\Documents\PowerShell\Modules\az.resources\6.12.0\MSGraph.Autorest\exports\ProxyCmdletDefinitions.ps1:3532
Line |
3532 |          $steppablePipeline = $scriptCmd.GetSteppablePipeline($MyInvoc …
     |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     | Exception calling "GetSteppablePipeline" with "1" argument(s): "The expression after '&' in a pipeline element
     | produced an object that was not valid. It must result in a command name, a script block, or a CommandInfo
     | object."

PS > $ExecutionContext.SessionState.LanguageMode = 'FullLanguage'

PS > get-azadgroup -DisplayName azurevirtualdesktop
ParentContainsErrorRecordException: ....\Documents\PowerShell\Modules\az.resources\6.12.0\MSGraph.Autorest\exports\ProxyCmdletDefinitions.ps1:3532
Line |
3532 |          $steppablePipeline = $scriptCmd.GetSteppablePipeline($MyInvoc …
     |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     | Exception calling "GetSteppablePipeline" with "1" argument(s): "The expression after '&' in a pipeline element
     | produced an object that was not valid. It must result in a command name, a script block, or a CommandInfo
     | object."

### Error details

```console
From PowershellCore/Operational:

Error Message = Exception calling "GetSteppablePipeline" with "1" argument(s): "The expression after '&' in a pipeline element produced an object that was not valid. It must result in a command name, a script block, or a CommandInfo object."
Fully Qualified Error ID = RuntimeException


Context:
        Severity = Warning
        Host Name = ConsoleHost
        Host Version = 7.4.0
        Host ID = e0d32791-7e3c-44a6-bbb3-c46817f36700
        Host Application = C:\Program Files\PowerShell\7\pwsh.dll
        Engine Version = 7.4.0
        Runspace ID = 33297d30-ce4f-4807-ba84-84f0aa1b96de
        Pipeline ID = 17
        Command Name = 
        Command Type = 
        Script Name = ....\Documents\PowerShell\Modules\az.resources\6.12.0\MSGraph.Autorest\exports\ProxyCmdletDefinitions.ps1
        Command Path = 
        Sequence Number = 10
        Connected User = 
        Shell ID = Microsoft.PowerShell


User Data:

Environment data

Name                           Value
----                           -----
PSVersion                      7.4.0
PSEdition                      Core
GitCommitId                    7.4.0
OS                             Microsoft Windows 10.0.19045
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Visuals

No response