Conversion from JSON failed

Start by reproducing the issue with winget configure and the supplied YAML, then inspect the VSComponents resource's Test invocation and the conversion error in the log. Done means identifying why the VSComponents configuration returns a non-JSON value and confirming that the supplied configuration can be tested without the conversion failure.

Trying to install components via winget configure, I get the error:
Apply :: VSComponents
The configuration unit failed while attempting to test the current system state.
Conversion from JSON failed with error: Unexpected character encountered while parsing value: V. Path '', line 0, position 0.

The log file has:

2025-05-14 16:54:22.303 [CONF] Configuration unit VSComponents[] failed with code 0x8a15c105 and error message:
Conversion from JSON failed with error: Unexpected character encountered while parsing value: V. Path '', line 0, position 0.
Microsoft.Management.Configuration.Processor.Exceptions.InvokeDscResourceException: Failed when calling `Test` for resource: VSComponents [Microsoft.VisualStudio.DSC] Message: 'Conversion from JSON failed with error: Unexpected character encountered while parsing value: V. Path '', line 0, position 0.

'

   at Microsoft.Management.Configuration.Processor.DscModule.DscModuleV2.InvokeTestResource(PowerShell pwsh, ValueSet settings, String name, ModuleSpecification moduleSpecification)

   at Microsoft.Management.Configuration.Processor.Runspaces.HostedEnvironment.InvokeTestResource(ValueSet settings, String name, ModuleSpecification moduleSpecification)

   at Microsoft.Management.Configuration.Processor.Unit.ConfigurationUnitProcessor.TestSettings()

Configuration snippet:

    - resource: Microsoft.WinGet.DSC/WinGetPackage
      id: vsPackage
      directives:
        description: Install Visual Studio 2019 Professional
      settings:
        id: Microsoft.VisualStudio.2019.Professional
        source: winget
        version: 16.11.9
    - resource: Microsoft.VisualStudio.DSC/VSComponents
      dependsOn:
        - vsPackage
      directives:
        description: Install required VS workloads from vsconfig file
        securityContext: elevated
        allowPrerelease: true
      settings:
        productId: Microsoft.VisualStudio.Product.Professional
        channelId: VisualStudio.16.Release
        includeRecommended: true
        components:
          - Microsoft.VisualStudio.Workload.ManagedDesktop
          - Microsoft.VisualStudio.Workload.VCTools
          - Microsoft.VisualStudio.Component.VC.ATL
          - Microsoft.VisualStudio.Component.VC.ATLMFC
          - Microsoft.VisualStudio.Component.VC.CLI.Support
          - Microsoft.VisualStudio.Component.WinXP
          - Microsoft.VisualStudio.Component.VC.v141.ATL
          - Microsoft.VisualStudio.Component.VC.v141.MFC