'Input gets changed inside a scriptblock

I have this script with a scriptblock:

$RoboArgs = @{
  Source = '01'
  Target = '02'
  ExtraArgs = '/e', '/purge'
}
Write-Host @RoboArgs
Start-ThreadJob -InputObject $RoboArgs -ScriptBlock {
  . robocopy_invoke.ps1
  Write-Host @input
} | Receive-Job -Wait -AutoRemoveJob

I want to call a function defined in the robocopy_invoke.ps1 module using the input parameter (Invoke-Robocopy @RoboArgs), but the input parameter's contents somehow get changed once it enters the scriptblock. Here's the output:

-Target: 02 -ExtraArgs: /e /purge -Source: 01
System.Management.Automation.Runspaces.PipelineReader`1+<GetReadEnumerator>d__20[System.Object]

Why is the output different for the two Write-Host calls? How can I make the second one like the first one?

powershell scriptblock

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'Input gets changed inside a scriptblock

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