Wait-Job behavior with timeout

[kaisxu]

Steps to reproduce

The code is aim to set time timeout for back ground jobs. I removed unrelated code here. The behavior is strange for me. Here is the code.

function JobWithTimeout {
    param(
        [System.Management.Automation.Job]
        [parameter(
            Mandatory = $true,
            ValueFromPipeline = $true)]
        [ValidateNotNull()]
        $Job,

        [parameter(Mandatory = $true)]
        [ValidateNotNull()]
        [int]
        $TimeoutInSec
    )
    
    Process {
        $Job | Wait-Job -Timeout $TimeoutInSec
        if ($(Get-Job -Id $Job.Id).State -eq "Running") {
            Write-Warning "Job timeout."
        }

        $Job| Stop-Job
        $Job| Receive-Job
        $Job| Remove-Job
    }
}

Start-Job -ScriptBlock {
    Write-Warning "res"
    $aaaa = 1   # <-- remove this line cause timeout
} | JobWithTimeout -Timeout 10

Expected behavior

Always get "WARNING: res"

Actual behavior

This code works fine and get result “Warning: res”. But if I remove L30, which is meaningless, the job always timeout while Wait-Job. Is this a expected behavior? Could you explain the underlying mechanisms to me?

Environment data

Tested on both Windows Powershell and Powershell Core

[iSazonov]

Please check on latest PowerShell 7 Preview build.

[kaisxu]

Same issue on 7.0.0-preview3

PS D:\> $PSVersionTable

Name                           Value
----                           -----
PSVersion                      7.0.0-preview.3
PSEdition                      Core
GitCommitId                    7.0.0-preview.3
OS                             Microsoft Windows 10.0.18362
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

[kaisxu]

Still repro in PowerShell 7.3.9, same script