biblatex: all references assigned number zero with continuous numbering without duplication and sorting=none

A solution for continuous numbering across sub-bibliograhies without duplication and with support for nocite was previously given. However, simply adding sorting=none to the biblatex package declaration causes all references to be assigned the number zero.

The following MWE is identical to the second one in the linked post, save for the addition of sorting=none:

documentclass{article}
usepackage[sorting=none,defernumbers=true]{biblatex}

makeatletter
defblx@citation@entry#1#2{%
  blx@bibreq{#1}%
  ifinlist{#1}blx@cites
    {}
    {listgadd{blx@cites}{#1}}%
  blx@auxwrite@mainaux{}{stringabx@aux@cite{#1}}%
  ifinlistcs{#1}{blx@segm@thec@refsection @thec@refsegment}
    {}
    {listcsgadd{blx@segm@thec@refsection @thec@refsegment}{#1}}%
  blx@auxwrite@mainaux{}{stringabx@aux@segm{thec@refsection}%
                                               {thec@refsegment}%
                                               {detokenize{#1}}}%
  ifcsundef{blx@entry@refsegment@thec@refsection @#1}
    {csnumgdef{blx@entry@refsegment@thec@refsection @#1}{thec@refsegment}}
    {}%
  blx@ifdata{#1}
    {}
    {ifcsdef{blx@miss@thec@refsection}
       {ifinlistcs{#1}{blx@miss@thec@refsection}
          {}
          {blx@logreq@active{#2{#1}}}}
       {blx@logreq@active{#2{#1}}}}}

defbibcheck{onlynew}{%
  ifnumless{0csuse{blx@entry@refsegment@thec@refsection @thefield{entrykey}}}{thec@refsegment}
    {skipentry}
    {}}
makeatother

addbibresource{biblatex-examples.bib}

begin{document}
newrefsegment
refsegment therefsegment:
cite{sigfridsson,worman}
printbibliography[segment=therefsegment,check=onlynew]

newrefsegment
refsegment therefsegment:
cite{sigfridsson,geer,nussbaum}nocite{knuth:ct:a}
printbibliography[segment=therefsegment,check=onlynew]

newrefsegment
refsegment therefsegment:
cite{sigfridsson,geer,pines,worman}nocite{knuth:ct:a,knuth:ct:b}
printbibliography[segment=therefsegment,check=onlynew]
end{document}

The document was compiled as follows:

$ pdflatex mwe.tex
$ biber mwe
$ pdflatex mwe.tex
$ pdflatex mwe.tex

However, no matter how many times pdflatex or biber are run, the following warning is always emitted:

LaTeX Warning: There were undefined references.


Package biblatex Warning: Please (re)run Biber on the file:
(biblatex)                mwe
(biblatex)                and rerun LaTeX afterwards.

The output is as follows:

The output of the blg file is as follows:

[0] Config.pm:304> INFO - This is Biber 2.12
[0] Config.pm:307> INFO - Logfile is 'mwe.blg'
[37] biber:315> INFO - === Sun Nov 24, 2019, 23:06:15
[62] Biber.pm:371> INFO - Reading 'mwe.bcf'
[151] Biber.pm:889> INFO - Found 7 citekeys in bib section 0
[169] Biber.pm:4093> INFO - Processing section 0
[182] Biber.pm:4254> INFO - Looking for bibtex format file 'biblatex-examples.bib' for section 0
[277] bibtex.pm:1512> INFO - LaTeX decoding ...
[560] bibtex.pm:1329> INFO - Found BibTeX data source '/usr/share/texlive/texmf-dist/bibtex/bib/biblatex/biblatex/biblatex-examples.bib'
[634] UCollate.pm:68> INFO - Overriding locale 'en-US' defaults 'normalization = NFD' with 'normalization = prenormalized'
[634] UCollate.pm:68> INFO - Overriding locale 'en-US' defaults 'variable = shifted' with 'variable = non-ignorable'
[634] Biber.pm:3921> INFO - Sorting list 'none/global//global/global' of type 'entry' with template 'none' and locale 'en-US'
[635] Biber.pm:3927> INFO - No sort tailoring available for locale 'en-US'
[640] bbl.pm:636> INFO - Writing 'mwe.bbl' with encoding 'UTF-8'
[644] bbl.pm:739> INFO - Output to mwe.bbl

The output of the log file is included here.

documentclass{article}
usepackage[sorting=none,defernumbers=true]{biblatex}

makeatletter
defblx@citation@entry#1#2{%
  blx@bibreq{#1}%
  ifinlist{#1}blx@cites
    {}
    {listgadd{blx@cites}{#1}%
     blx@auxwrite@mainaux{}{stringabx@aux@cite{#1}}}%
  ifinlistcs{#1}{blx@segm@thec@refsection @thec@refsegment}
    {}
    {listcsgadd{blx@segm@thec@refsection @thec@refsegment}{#1}}%
  blx@auxwrite@mainaux{}{%
    stringabx@aux@segm{thec@refsection}{thec@refsegment}{detokenize{#1}}}%
  ifcsundef{blx@entry@refsegment@thec@refsection @#1}
    {csnumgdef{blx@entry@refsegment@thec@refsection @#1}{thec@refsegment}}
    {}%
  blx@ifdata{#1}
    {}
    {ifcsdef{blx@miss@thec@refsection}
       {ifinlistcs{#1}{blx@miss@thec@refsection}
          {}
          {blx@logreq@active{#2{#1}}}}
       {blx@logreq@active{#2{#1}}}}}


defbibcheck{onlynew}{%
  ifnumless{0csuse{blx@entry@refsegment@thec@refsection @thefield{entrykey}}}
            {thec@refsegment}
    {skipentry}
    {}}
makeatother

addbibresource{biblatex-examples.bib}

begin{document}
newrefsegment
refsegment therefsegment:
cite{sigfridsson,worman}
printbibliography[segment=therefsegment,check=onlynew]

newrefsegment
refsegment therefsegment:
cite{sigfridsson,geer,nussbaum}nocite{knuth:ct:a}
printbibliography[segment=therefsegment,check=onlynew]

newrefsegment
refsegment therefsegment:
cite{sigfridsson,geer,pines,worman}nocite{knuth:ct:a,knuth:ct:b}
printbibliography[segment=therefsegment,check=onlynew]
end{document}