Follow-up Comment #1, bug #63142 (project groff):
Heirloom Doctools troff in non-groff compatibility mode:
$ ./bin/nroff -V
Heirloom doctools nroff, release 191015
$ printf '.xflag 0\n\A\nABC\nD\n.pl \\n(nlu\n' | ./bin/nroff
ABC D
$ printf '.xflag 0\n.sp\n\b\nABC\nD\n.pl \\n(nlu\n' | ./bin/nroff
ABC D
$ printf '.xflag 0\n\o\nABC\nD\n.pl \\n(nlu\n' | ./bin/nroff
ABC D
$ printf '.xflag 0\n\w\nABC\nD\n.pl \\n(nlu\n' | ./bin/nroff
0ABC D
$ printf '.xflag 0\n\X\nABC\nD\n.pl \\n(nlu\n' | ./bin/nroff
ABC D
$ printf '.xflag 0\n\Z\nABC\nD\n.pl \\n(nlu\n' | ./bin/nroff | cat -s
ABC D
DWB 3.3:
$ ./bin/nroff -V
nroff: DWB 3.3 8/3/16 18:29
$ printf '\A\nABC\nD\n.pl \\n(nlu\n' | ./bin/nroff | cat -s
A ABC D
$ printf '.sp\n\b\nABC\nD\n.pl \\n(nlu\n' | ./bin/nroff
ABC D
$ printf '\o\nABC\nD\n.pl \\n(nlu\n' | ./bin/nroff
ABC D
$ printf '\w\nABC\nD\n.pl \\n(nlu\n' | ./bin/nroff
0ABC D
$ printf '\X\nABC\nD\n.pl \\n(nlu\n' | ./bin/nroff
ABC D
$ printf '\Z\nABC\nD\n.pl \\n(nlu\n' | ./bin/nroff | cat -s
Z ABC D
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