Follow-up Comment #1, bug #67344 (group groff): `SH` and `SS` also misbehave, but this is _not_ a regression from _groff_ 1.22.4 to 1.23.0. Instead, the older version silently discarded the (sub)section heading text.
_grotty_ in _groff_ 1.23.0 isn't silent about it.
$ printf '.SH Heading\n' | ~/groff-1.22.4/bin/groff -rCHECKSTYLE=4 -man
-Tascii | cat -s | grep . || echo NO OUTPUT
NO OUTPUT
$ printf '.SS Heading\n' | ~/groff-1.22.4/bin/groff -rCHECKSTYLE=4 -man
-Tascii | cat -s | grep . || echo NO OUTPUT
NO OUTPUT
$ printf '.SH Heading\n' | ~/groff-1.23.0/bin/groff -rCHECKSTYLE=4 -man
-Tascii | cat -s | grep . || echo NO OUTPUT
grotty:<standard input>:13: error: output above first line discarded
grotty:<standard input>:14: error: output above first line discarded
grotty:<standard input>:15: error: output above first line discarded
grotty:<standard input>:15: error: output above first line discarded
grotty:<standard input>:15: error: output above first line discarded
grotty:<standard input>:15: error: output above first line discarded
grotty:<standard input>:15: error: output above first line discarded
grotty:<standard input>:15: error: output above first line discarded
grotty:<standard input>:15: error: output above first line discarded
NO OUTPUT
$ printf '.SS Heading\n' | ~/groff-1.23.0/bin/groff -rCHECKSTYLE=4 -man
-Tascii | cat -s | grep . || echo NO OUTPUT
grotty:<standard input>:7: error: output above first line discarded
grotty:<standard input>:15: error: output above first line discarded
grotty:<standard input>:16: error: output above first line discarded
grotty:<standard input>:16: error: output above first line discarded
grotty:<standard input>:16: error: output above first line discarded
grotty:<standard input>:16: error: output above first line discarded
grotty:<standard input>:16: error: output above first line discarded
grotty:<standard input>:16: error: output above first line discarded
grotty:<standard input>:16: error: output above first line discarded
NO OUTPUT
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