Weird behaviour when sending a PSCustomObject with PSCredentials from a Dashboard to a PSUScript using Invoke-PSUScript

[chauberg]

Description of Issue

I have a dashboard where I define a settings variable which is a PSCustomObject with some PSCredential variables inside, this is used in the dashboard for some function calls and then sent to a PSUScript using Invoke-PSUScript - the issue I'm having is that this works correctly sometimes (usually after a Dashboard restart) and then randomly fails, it seems like the types get wonky randomly.

I made the following test setup to replicate the issue:
Dashboard

function CallScript
{
    param ([PSCustomObject]$Settings)

    $scriptParameters = @{
        Settings = $Settings
    }
    Invoke-PSUScript -Script (Get-PSUScript -Name "TestCred.ps1") @scriptParameters | Tee-Object -Variable job | Wait-PSUJob
    $result = Get-PSUJobPipelineOutput -Job $job
    Write-Host $result
}

New-UDApp -Content {
    [PSCustomObject]$test = @{
        TestCredential = $Secret:PsCredentialTest
    }

    New-UDForm -Id "Form" -Content {} -OnSubmit {
        CallScript -Settings $test
    }
}

TestCred.ps1

param (
    [Parameter(Mandatory)]
    [PSCustomObject]
    [ValidateScript({
        function Validate
        {
            param (
                [Parameter(Mandatory)]
                [PSCredential]
                $TestCredential
            )
            return $true
        }
        $settings = $_
        Validate @settings
    })]
    $Settings
    )

Write-Host ($Settings | ConvertTo-Json)

I use a ValidateScript parameter in the script to ensure that the credential is passed properly.

As I type this I've clicked the submit button in the dashboard a couple of times where it has randomly succeeded the validation and also failed without me changing anything in the dashboard or the script.

I'm at a loss here, please help :D

Version

5.2.1

Severity

Medium

Hosting Method

MSI (Windows Service)

Operating System

Windows

Database

SQL

Licensed

Yes

Features

No response

Additional Environment data

No response

Screenshots/Animations

No response

[chauberg]

Note that I am actually using a hashtable, not a PSCustomObject as the latter doesn't seem to play nice with splatting but it doesn't change the underlying issue, it seems that often the PSCredentials are delivered as a different type "System.Management.Automation.PSObject" instead of PSCredential which bricks the validation.. I made a function that iterates over my hashtable and casts properties to PSCredential inside the PSUScript before passing it into the function with validation as a hacky solution.