PowerShell attach removes existing breakpoints in attached session

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

I use VSCode PowerShell debugger by attaching to a process hosting PowerShell.
Attaching removes breakpoints that I have already set in my session.

PowerShell Version

Name                           Value
----                           -----
PSVersion                      7.3.3
PSEdition                      Core
GitCommitId                    7.3.3
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

Visual Studio Code Version

1.73.1
6261075646f055b99068d3688932416f2346dd3b
x64

Extension Version

ms-vscode.powershell@2023.3.3

Steps to Reproduce

(1) Invoke the below script test1.ps1 in some PowerShell session. E.g. I used and saw the problem in powershell and pwsh consoles and in my application hosting PowerShell as well.

function global:test1 {
	'hi'
}
Set-PSBreakpoint -Command test1
Set-PSBreakpoint -Script $PSScriptRoot\test1.ps1 -Line 2

(2) Run Get-PSBreakpoint -- see 2 breakpoints

(3) In VSCode, launch/attach PowerShell debugger configured as below.
Select the target process where we have set 2 breakpoints.

      {
        "type": "PowerShell",
        "request": "attach",
        "name": "PowerShell attach",
        "processId": "${command:PickPSHostProcess}",
        "runspaceId": 1
      },

(4) With the debugger attached, run Get-PSBreakpoint again -- see that breakpoints are gone.

Visuals

No response

Logs

No response

Reproduce the issue with the provided test1.ps1 script, two Set-PSBreakpoint calls, and the PowerShell attach configuration using PickPSHostProcess. Start by tracing the debugger attach flow and compare Get-PSBreakpoint before and after attachment. Done means attaching preserves both existing breakpoints; no test file or source entry point is named in the issue.