Is there confliction between "gsnContourZeroLineThicknessF" and "gsnContourZeroLineThicknessF" when panel the contour maps in NCL5.2.1?

Hi,
     In new version 5.2.1 of NCL, there seems confliction between "gsnContourZeroLineThicknessF" and "gsnContourZeroLineThicknessF" when panel the contour maps.
     That is to say:
  ;----------------------------------------------------
  ; This two settings seems controvacy if both set on
             res@gsnContourZeroLineThicknessF = 1.5 ; doubles thickness of zero contour
             res@gsnContourNegLineDashPattern = 2 ; sets negative contours to dash pattern 1 ;
  ;----------------------------------------------------

     The following is my scripts(the data is attached behind the letter):

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"
undef("sub_draw_hor")
function sub_draw_hor(wks,h,opt,ti)
local wks,h,res,res1,plot,plot1,ploth,opt,ti
begin
;
; draw Plots
;......
     print (""+ti)
             ;wks =gsn_open_wks("eps",outname)
             ;gsn_define_colormap(wks,"nrl_sirkes") ; choose color map
             res = True
             res@gsnDraw = False ; don't draw yet
             res@gsnFrame = False ; don't advance frame yet
             res@gsnMaximize = False

             res@cnFillOn = False ; True ;False ;True ;False ;True ; turn on color for contours
             res@cnLinesOn = True ;False ;True ;False ; turn off contour lines
             res@cnLineLabelsOn = False

             ;res@vpXF = 0.2
             ;res@vpYF = 0.8
             res@vpWidthF = 0.14
             res@vpHeightF = 0.08
             res@gsnPaperOrientation = "portrait"

             res@tiMainString = "" ; ti
             res@tiMainOn = False ; ti
             res@tiXAxisOn = False
             res@gsnLeftString = ti
             res@gsnLeftStringFontHeightF = 0.005
             res@gsnCenterString = ""
             res@gsnRightString = ""
             res@tmXBOn = opt
             res@tmXTOn = False
             res@tmYROn = False

             res@cnLineLabelsOn = False ; turn off line labels
             res@cnInfoLabelOn = False

             ;res@cnInfoLabelOn = False
             ;res@cnLineLabelFormat = "@*+^sg"

             res@tmYLMode = "Explicit" ; label independently
             res@tmYLValues = h&time(::8)
             res@tmYLLabels = (/0,0.5,1,1.5,2/)
             ;res@tmYLLabelFontHeightF = 0.020

             ; res@gsnContourLineThicknessesScale = 1.;
             ;res@gsnContourLineThicknessF = 1.

  ;----------------------------------------------------
  ; This two settings seems controvacy if both set on
             res@gsnContourZeroLineThicknessF = 1.5 ; doubles thickness of zero contour
             res@gsnContourNegLineDashPattern = 2 ; sets negative contours to dash pattern 1
  ;
  ;----------------------------------------------------
              res@cnLevelSelectionMode ="ManualLevels"
              res@cnLevelSpacingF = 10
              res@cnMinLevelValF = -60.
              res@cnMaxLevelValF = 60.

             plot = gsn_csm_contour(wks, h(time|:,lat|:), res)

return(plot)

end

;====================================================================
begin

   outname = "./t"

   f = addfile ("t.nc" , "r")
   printVarSummary(f)
   a0 = f->a0
   a1 = f->a1
   a2 = f->a2
   a3 = f->a3
printVarSummary(a0)
;return
;
; draw Plots
;......
  wks =gsn_open_wks("eps",outname)
  gsn_define_colormap(wks,"nrl_sirkes") ; choose color map
  plots = new(4,graphic)

  opt = False
  ti = "a)aa "
  plots(0)=sub_draw_hor(wks,a0,opt,ti)

  opt = False
  ti = "c)bbbb"
  plots(1)=sub_draw_hor(wks,a1,opt,ti)

  opt = True
  ti = "b)ccccc"
  plots(2)=sub_draw_hor(wks,a2,opt,ti)

  opt = True
  ti ="d)ddddddddddddddddddddddddddddddddddddddddddddddddddddddddd"
  plots(3)=sub_draw_hor(wks,a3,opt,ti)

  resP = True ; modify the panel plot
  resP@gsnMaximize = True

  resP@gsnFrame = False
  resP@gsnPaperOrientation = "portrait"
  resP@gsnPanelBottom = 0.05
  resP@gsnPanelLabelBar = False
  resP@gsnPanelScalePlotIndex = 1

  gsn_panel(wks,plots,(/2,2/),resP)
  frame(wks)

end

   Any help or suggestion is appriciatable.

Sincerely,
Li

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