[pstricks] error with pscurve and showpoints=true

[Bréal Frédéric]

Good morning,

I can't compile this example with  latex + dvips + ps2pdf -dNOSAFER and 
xubuntu 20.04 + texlive 2021 + gs 9.50.
Is my configuration wrong ?
Thanks for help.

Frédéric Bréal

\documentclass[12pt,a4paper]{article}
\usepackage{pstricks}
\listfiles{}
\begin{document}
\begin{pspicture}[showgrid=true](1,-1)(4,1)
\pscurve[showpoints=true](2.1,-0.2)(2.5,0.2)(3.2,0.235)(3.8,-0.2)
\end{pspicture}

Error: /undefined in Points Operand stack: Execution stack: %interp_exit 
.runexec2 --nostringval-- --nostringval-- --nostringval-- 2 
%stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 
%stopped_push 1990 1 3 %oparray_pop 1989 1 3 %oparray_pop 1977 1 3 
%oparray_pop 1833 1 3 %oparray_pop --nostringval-- %errorexec_pop 
.runexec2 --nostringval-- --nostringval-- --nostringval-- 2 
%stopped_push --nostringval-- Dictionary stack: --dict:742/112
3(ro)(G)-- --dict:0/20(G)-- --dict:143/200(L)-- --dict:180/300(L)-- 
--dict:38/200(L)-- --dict:134/200(L)-- Current allocation mode is local 
Current file position is 118615 GPL Ghostscript 9.50: Unrecoverable 
error, exit code 1
Processus terminé avec une ou plusieurs erreurs

Processus terminé avec une ou plusieurs erreurs


With an older version, the compilation works.

[code] *File List*
  article.cls    2020/04/10 v1.4m Standard LaTeX document class
   size12.clo    2020/04/10 v1.4m Standard LaTeX file (size option)
pstricks.sty    2020/06/11 v0.70 LaTeX wrapper for `PSTricks' (RN,HV)
    iftex.sty    2020/03/06 v1.0d TeX engine tests
   xcolor.sty    2016/05/11 v2.12 LaTeX color extensions (UK)
    color.cfg    2016/01/02 v1.6 sample color configuration
    dvips.def    2017/06/20 v3.1d Graphics/color driver for dvips
pst-xkey.tex    2005/11/25 v1.6 PSTricks specialization of xkeyval (HA)
pst-xkey.tex    2005/11/25 v1.6 PSTricks specialization of xkeyval (HA)
  xkeyval.sty    2020/11/20 v2.8 package option processing (HA)
  xkeyval.tex    2014/12/03 v2.7a key=value parser (HA)
pstricks.tex    2020/09/18 v3.01 `PSTricks' (tvz,hv)
   pst-fp.tex    2020/09/18 v3.01 `PST-fp' (hv)
l3backend-dvips.def    2020-01-29 L3 backend support: dvips
  ***********||
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