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Netlisting flowchart postFunc called multiple times with Assembler & ICRP job control

smikes
I'm attempting to insert a custom function in the netlist flowchart that will modify the netlist after creation.
This works in most cases. I'm netlisting/running from ADE Assembler.
If I just netlist by right-clicking the test and selecting netlist->recreate, it works as intended, with the function called once.
If I select the "LSCS" job control method and run, it also works as intended with the function called a single time.
However, if I select "ICRP" job control and run, the procedure seems to be getting called multiple times, which messes up the netlist.
My code is below, it calls an external Python function after netlisting that performs the modification.
As a debug aid, I added the fprintf to a log file in my home dir to verify that this function is indeed called more than once.
Here's the result after one attempt (using ICRP):
$> cat ~/wrapper.log
wrapper has been called from session=stdobj@0x50391068, name=spectre0
wrapper has been called from session=stdobj@0x4f82f080, name=spectre0
wrapper has been called from session=stdobj@0x4f82f080, name=spectre0
For direct netlisting or LCSC, there is only a single entry in the log file.
I don't understand the netlisting flowchart process well enough to know why this function is being called multiple times (with ICRP control only).
For some other reasons I'm restricted in some cases to using the ICRP job control, so I can't just ignore this issue by not using it.
Is there a work-around for this? I need the function to be called only once, after the netlist is created.
Using sub-version  ICADVM20.1-64b.500.15
Thanks,
Steven

procedure(SEMparaboxWrapper(session)

let((netlistDir command pid fh)

    when(getd('SEMexistingNetlistPostFunc)

        SEMexistingNetlistPostFunc(session)

    )

    netlistDir = asiGetNetlistDir(session)

    printf("  Adding parabox wrappers to %s/netlist\n" netlistDir)

    fh = outfile("/home/stevenm/wrapper.log" "a")

    fprintf(fh "wrapper has been called from session=%L, name=%L\n" session session->name)

    close(fh)

    command = strcat(getShellEnvVar("CDS_WORKAREA") "/wrap.py " netlistDir "/netlist")

    pid = ipcBeginProcess(command)

    ipcWait(pid)

)

)

 

let( (flow step postFunc)

    flow = asiGetFlowchart(asiGetTool('spectre))

    step = asiGetFlowchartStep(flow 'asiNetlist)

    postFunc = step->postFunc

    when(postFunc && neq(postFunc 'SEMparaboxWrapper)

        putd('SEMexistingNetlistPostFunc getd(postFunc))

    )

    asiChangeFlowchartStep(flow ?name 'asiNetlist ?postFunc 'SEMparaboxWrapper)

)

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