wrong variables assignment when calling groovy function under "script:"

[Damian Loska]

Hey, I've noticed strange behaviour:

Inside my NF script I've created a function, that just take a key nad a map and pulls out values from this map:

(...)
def parse_sname(snamef, inmapf){
    pnamef    = inmapf[snamef].pname
    bnamef    = inmapf[snamef].bname
    panelf    = inmapf[snamef].panel
    numef     = inmapf[snamef].nume
    idsamplef = pnamef +"_"+ numef
    return [pnamef, bnamef, panelf, numef, idsamplef]
}

then I use this function in process like this:

  process CoverageExonsDam {
    maxForks 3
    tag        "$pname"

    input:
      set sname, file(bam), file(bai) from BamCh1

    script:
      (pname, bname, panel, nume, idsample) = parse_sname(sname, inmap)

  """
  echo $sname >> ${sname}.cov.txt
  echo $pname >> ${sname}.cov.txt
  echo $bam >> ${sname}.cov.txt

  """
  }

when I run a script, the output is unexpected:

Seems like "CoverageExonsDam" is executed three times ONLY for one element from the channel as we see tag "sampA", but in fact processes were finished correctly:

when I don't use parse_sname(sname, inmap) function, everything works normal.

  process CoverageExonsDam {
    maxForks 3
    tag        "$pname"

    input:
      set sname, file(bam), file(bai) from BamCh1

    script: 
      pname    = inmap[sname].pname
      bname    = inmap[sname].bname
      panel    = inmap[sname].panel
      nume     = inmap[sname].nume
      idsample = pname +"_"+ nume

  """

  echo $sname >> ${sname}.cov.txt
  echo $pname >> ${sname}.cov.txt
  echo $bam >> ${sname}.cov.txt


  """
  }

Why using groovy functions under "script" is making such problems?

(I don't use DLS2, it's just a simple nf script)