if statement in Start-Job scriptblock

I'm trying to create a simple network scanner using PowerShell and I want it to run multiple "pings (or in this case test-connection)" in parallel.

Start-Job seems to be the best way to accomplish this multi-threading scenario.

Here is a simplified example of what i'm trying to do.

$list=@("192.168.1.1", "192.168.1.2", "192.168.1.3", "192.168.1.4")

ForEach ($item In $list) {
  Start-Job -ScriptBlock {
    if (Test-Connection $item -Quiet -Count 1) {
      Add-Content -value "$item found" -Path C:\logs\test.txt
    }
  }
}

This however does nothing. If I remove the Start-Job part it does work, but loses its multiprocessing. If I remove the if statement the writing to file part works.

So the issue seems to be when using an if statement in a scriptblock within a job.

There must be something about the start-job command i'm missing. Or is there any better way to create this kind of script?