PST: rput not placing content at all (regression with texlive 2019)

This is a MWE using rput in full-page picture to put text to the middle of the page:

documentclass{article}
usepackage[paperheight=100mm,paperwidth=100mm,margin=0mm,noheadfoot]{geometry}
usepackage{pstricks}
begin{document}
    psset{unit=1mm}
    begin{pspicture}(0,0)(paperwidth,paperheight)
        rput[bl](50mm,50mm){abc}
    end{pspicture}
end{document}

and this is the result:

This was compiled with xelatex on TeXlive 2019.202000218 (as packaged in Ubuntu 20.04). I am quite sure rput used to work correctly as a more complex document, where this was used, is now broken and used to work (= abc was placed correctly) before the upgrade from Ubuntu 18.04 and related TEXlive packages.

Is there a problem on my side? Is there some fix for this?

Thanks!

PS: compiling via latex → dvips places the text correctly.