Description of a situation where a runbook will fail to run, even if the necessary "child runbook" is in place

ChildRunbookPublishFail.ps1

#Configure the environment
    $smawebserviceurl = "https://trondcloud-cs.cloudapp.net"
    $smacreds = get-credential


#Set up two test runbooks, one referenced by the other (testwf1 references testwf2)
$TestWF1 = @"
    workflow testwf1 
    {
        Param ([switch]$Test)
        if ($test)
        {
            return
        }
        testwf2
    }
"@


$TestWF2 = @"
    workflow testwf2
    {
        Write-output "this is testwf2"
    }
"@


#Set the default params since I'm lazy
    $PSDefaultParameterValues.Add("*sma*:WebServiceEndpoint",$smawebserviceurl)
    $PSDefaultParameterValues.Add("*sma*:credential",$smacreds)

#Upload and publish the first runbook
    #SMA doesn't support taking the contents from a var, so stream it to a temp file
    $wf1tempfile = join-path ($env:temp) (get-random)
    Set-Content -path $wf1tempfile -Value $TestWF1 -Force
    $rb1 = Import-SmaRunbook -Path $wf1tempfile
    remove-item $wf1tempfile -Confirm:$false

    Publish-SmaRunbook -Id $rb1.RunbookID

#Start the first runbook. Execution should fail, as its missing its child workflow
    $rb1FirstStart = Start-SmaRunbook -Id $rb1.RunbookID
    Do
    {
        #Skip waiting if its the first run
        if ($firstrun -eq $false) {Start-sleep -Seconds 2}
        $firstrun = $false
        $jobstatus = Get-SmaJob -Id $rb1FirstStart
    }
    until ("Failed","Completed"  -contains $jobstatus.JobStatus)
    
#We expect this to fail, as we havent upladed the child workflow yet
    if ($jobstatus.JobStatus -eq "failed")
    {
        Write-host $jobstatus.JobException
    }

#Okay, it failed because its missing testwf2. Lets upload that and see what happens

#Upload the second (child) runbook
    #SMA doesn't support taking the contents from a var, so stream it to a temp file
    $wf2tempfile = join-path ($env:temp) (get-random)
    Set-Content -path $wf2tempfile -Value $TestWF2 -Force
    $rb2 = Import-SmaRunbook -Path $wf2tempfile
    remove-item $wf2tempfile -Confirm:$false

#Start the runbook just to see that it runs
    Publish-SmaRunbook -Id $rb2.RunbookID
    $rb2FirstStart = Start-SmaRunbook -Id $rb2.RunbookID

    Do
    {
        #Skip waiting if its the first run
        if ($firstrun -eq $false) {Start-sleep -Seconds 2}
        $firstrun = $false
        $jobstatus = Get-SmaJob -Id $rb2FirstStart
    }
    until ("Failed","Completed"  -contains $jobstatus.JobStatus)

#We're assuming testwf2 ran fine, since it doesnt have any depencies/children
    Write-host "wf2 status: $($jobstatus.JobStatus)"

#Lets try running wf1 again, now that all child runbooks are in place:
    $rb1SecondStart = Start-SmaRunbook -Id $rb1.RunbookID

    Do
    {
        #Skip waiting if its the first run
        if ($firstrun -eq $false) {Start-sleep -Seconds 2}
        $firstrun = $false
        $jobstatus = Get-SmaJob -Id $rb1SecondStart
    }
    until ("Failed","Completed"  -contains $jobstatus.JobStatus)

#Testwf1 fails again, although the required child workflow is in place:
    write-host $jobstatus.JobException

#This is the bug. The only way to get aroud it, is to delete/republish testwf1, either in the gui or in code:
    Remove-SmaRunbook -Id $rb1.RunbookID

#Re-upload testwf1
    $wf1tempfile = join-path ($env:temp) (get-random)
    Set-Content -path $wf1tempfile -Value $TestWF1 -Force
    $rb1 = Import-SmaRunbook -Path $wf1tempfile
    remove-item $wf1tempfile -Confirm:$false
    Publish-SmaRunbook -Id $rb1.RunbookID

    $rb1ThirdStart = Start-SmaRunbook -Id $rb1.RunbookID

    Write-host "Starting re-uploaded runbook"
    Do
    {
        #Skip waiting if its the first run
        if ($firstrun -eq $false) {Start-sleep -Seconds 2}
        $firstrun = $false
        $jobstatus = Get-SmaJob -Id $rb1ThirdStart
    }
    until ("Failed","Completed"  -contains $jobstatus.JobStatus)

#This time, the runbook succeeded
write-host "Status of re-uploaded testwf1: $($jobstatus.JobStatus)"