Follow-up Comment #12, bug #64421 (project groff):
I recreated the PDF file with Arch Linux's groff-1.23.0-3-x86_64.pkg.tar.zst
and groff-1.22.4-10-x86_64.pkg.tar.zst packages, using the -P-d flag, as
follows. I reinstalled the old package version from a separate terminal in
between running these.
-verbatim-
gnoack:~/momrepro$ sh repro.sh > groff-1.22.4-10-d.pdf
troff: <standard input>:5: can't transparently output node at top level
gnoack:~/momrepro$ sh repro.sh > groff-1.23.0-d.pdf
gnoack:~/momrepro$ cat repro.sh
#!/bin/sh
cat <<EOF | groff -P-d -mom -Tpdf
.TITLE "Example"
.DOCTYPE LETTER
.PRINTSTYLE TYPESET
.PAPER A4
.START
.DRH
EOF
gnoack:~/momrepro$
Interesting is also that the invocation with the old groff version is printing
this warning, while the new groff version does not.
I also verified that it's not a funny interaction with my PDF viewer. I can
see the "black" label with all of evince, zathura and mupdf.
The two PDF files are attached.
I can also confirm that it works with the Postscript backend, when groff is
invoked with groff -mom -Tps. That file is also attached.
(file #54949, file #54950, file #54951)
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Additional Item Attachment:
File name: groff-1.22.4-10-d.pdf Size:9 KB
<https://file.savannah.gnu.org/file/groff-1.22.4-10-d.pdf?file_id=54949>
File name: groff-1.23.0.ps Size:8 KB
<https://file.savannah.gnu.org/file/groff-1.23.0.ps?file_id=54950>
File name: groff-1.23.0-d.pdf Size:9 KB
<https://file.savannah.gnu.org/file/groff-1.23.0-d.pdf?file_id=54951>
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