$PSScriptRoot is not populated when used in a default value for a non-mandatory script parameter

Steps to reproduce

Run this script (via PowerShell -File ....)

param(
    [Parameter(Mandatory = $false)]
    [string] $Foo = 'hi\{0}\hi' -f $PSScriptRoot
)

Write-Host $Foo

Function Bar {
    param(
        [Parameter(Mandatory = $false)]
        [string] $Bar = $PSScriptRoot
    )
    Write-Host $Bar
}

Function Baz {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $false)]
        [string] $Baz = $PSScriptRoot
    )
    Write-Host $Baz
}

Bar
Baz

Expected behavior

hi\C:\tmp\hi
C:\tmp
C:\tmp

Actual behavior

hi\\hi
C:\tmp
C:\tmp

Environment data

Name                           Value
----                           -----
PSVersion                      5.1.16353.1000
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.16353.1000
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

[edited by @daxian-dbw to put the repro in code blocks]

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$PSScriptRoot is not populated when used in a default value for a non-mandatory script parameter #4688

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$PSScriptRoot is not populated when used in a default value for a non-mandatory script parameter #4688

Description

Steps to reproduce

Expected behavior

Actual behavior

Environment data

Metadata

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Development

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