Conditional Breakpoint query does not work in pipeline ($_ not recognized)

Prerequisites

• I have written a descriptive issue title.
• I have searched all open and closed issues to ensure it has not already been reported.
• I have read the troubleshooting guide.
• I am sure this issue is with the extension itself and does not reproduce in a standalone PowerShell instance.
• I have verified that I am using the latest version of Visual Studio Code and the PowerShell extension.
• If this is a security issue, I have read the security issue reporting guidance.

Summary

Hi there,

During PSConfEU there was a demo about VSCode and I was following along and I realized that for conditional breakpoints there seems to be a bug where $_ would not be recognized in the queries. If I would use the conditional breakpoint in a foreach loop (keyword) it would work no problem with the loop variable. The issue as far as I can see only exist in Foreach-Object within the pipeline.

PowerShell Version

PS /Users/kevinbates/Code/PSConf25> $PSVersionTable; $host 

Name                           Value
----                           -----
PSVersion                      7.4.6
PSEdition                      Core
GitCommitId                    7.4.6
OS                             Darwin 24.5.0 Darwin Kernel Version 24.5.0: Tue Apr 22 19:54:25 PDT 2025; root:xnu-11417.121.6~2/RELEASE_ARM64_T6020
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Name             : Visual Studio Code Host
Version          : 2025.0.0
InstanceId       : 4c1c07d9-cbf8-40b2-8f41-6c2866edb05b
UI               : System.Management.Automation.Internal.Host.InternalHostUserInterface
CurrentCulture   : en-US
CurrentUICulture : en-US
PrivateData      : Microsoft.PowerShell.ConsoleHost+ConsoleColorProxy
DebuggerEnabled  : True
IsRunspacePushed : False
Runspace         : System.Management.Automation.Runspaces.LocalRunspace

Visual Studio Code Version

PS /Users/kevinbates/Code/PSConf25> code --version
1.100.3
258e40fedc6cb8edf399a463ce3a9d32e7e1f6f3
arm64

Extension Version

PS /Users/kevinbates/Code/PSConf25> code --list-extensions --show-versions | select-string powershell

ms-vscode.powershell@2025.0.0

Steps to Reproduce

I can run this piece of code:

$numbers = 1..100

foreach($number in $numbers){
    write-host $number
}

with the following conditional breakpoint on the line within the loop:

$number -eq 100

And the breakpoint will hit as expected. If I change up my code to use Foreach-Object. It will no longer hit.

1..100 | ForEach-Object {
    write-host $_
}

with the following expression:

$_ -eq 5

Visuals

No response

Logs

No response

Start by reproducing the conditional-breakpoint behavior in Visual Studio Code with the PowerShell extension, comparing the foreach loop with the ForEach-Object pipeline example from the issue. Trace the conditional breakpoint handling entry point and verify that $_ -eq 5 stops execution in the pipeline case without breaking the existing $number -eq 100 behavior.