SetValue for nested field throws "Unable to cast object"

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 PowerShell Editor Services itself and does not reproduce in a standalone PowerShell instance, and is not an issue with my editor.
• I have verified that I am using the latest version of PowerShell Editor Services.
• If this is a security issue, I have read the security issue reporting guidance.

Summary

Setting nested field value throws
Unable to cast object of type 'Microsoft.PowerShell.EditorServices.Services.DebugAdapter.VariableDetails' to type 'Microsoft.PowerShell.EditorServices.Services.DebugAdapter.VariableContainerDetails'.

The code below should be causing the problem.

https://github.com/PowerShell/PowerShellEditorServices/blob/41fce39f491d5d351b4ac5864e89857ec070e107/src/PowerShellEditorServices/Services/DebugAdapter/DebugService.cs#L390

PowerShell Version

Name                           Value
----                           -----
PSVersion                      7.4.3
PSEdition                      Core
GitCommitId                    7.4.3
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

Editor Version

Visual Studio Code
Version: 1.91.1 (user setup)
Commit: f1e16e1e6214d7c44d078b1f0607b2388f29d729
Date: 2024-07-09T22:06:49.809Z
Electron: 29.4.0
ElectronBuildId: 9728852
Chromium: 122.0.6261.156
Node.js: 20.9.0
V8: 12.2.281.27-electron.0
OS: Windows_NT x64 10.0.19045

PowerShell Editor Services Version

Major  Minor  Build  Revision
-----  -----  -----  --------
3      20     1      0

Steps to Reproduce

$val = [PSCustomObject]@{
    NestedField = "Test"
}
Write-Host $val
while ($true) {
    Write-Host $val   
}

1. Put breakpoint on line 4 (Write-Host $val)
2. Start debugging
3. Open "Local" scope in Variables tab
4. Find $val and change NestedField value

Visuals

No response

Logs

No response

Start with src/PowerShellEditorServices/Services/DebugAdapter/DebugService.cs around line 390, then reproduce the reported steps with the nested PSCustomObject while debugging. Trace the SetValue path when changing NestedField and verify that the update completes without the VariableDetails-to-VariableContainerDetails cast error.