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

This is a sub-issue of #25242.

The cmdlet New-PSSession does not respect explicit $false values for the -UseWindowsPowerShell switch parameter.

PS> $session = New-PSSession -UseWindowsPowerShell:$false
PS> $session.Runspace.ConnectionInfo.ShellUri

Expected behavior

PS> $session = New-PSSession -UseWindowsPowerShell:$false
PS> $session.Runspace.ConnectionInfo.ShellUri
http://schemas.microsoft.com/powershell/Microsoft.PowerShell

-UseWindowsPowerShell:$false should behave the same as omitting the -UseWindowsPowerShell switch, creating a session with the default PowerShell endpoint.

Actual behavior

PS> $session = New-PSSession -UseWindowsPowerShell:$false
PS> $session.Runspace.ConnectionInfo.ShellUri
http://schemas.microsoft.com/powershell/Microsoft.PowerShell.Workflow

-UseWindowsPowerShell:$false behaves the same as -UseWindowsPowerShell or -UseWindowsPowerShell:$true, creating a session with Windows PowerShell 5.1 endpoint.

Error details

No error is thrown. The cmdlet executes but ignores the explicit $false value.

Environment data

PS> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      7.5.4
PSEdition                      Core
GitCommitId                    7.5.4
OS                             Microsoft Windows 10.0.26100
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