Follow-up Comment #2, bug #68064 (group groff): While I also cannot reproduce this in 1.23, I can in 1.22.4, but only if the register is sent to stdout rather than stderr.
$ groff --version | head -1
GNU groff version 1.22.4
$ printf '.sy /bin/false\n.tm \\n[systat]\n' | nroff -U | cat -s
256
$ printf '.sy /bin/false\n\\n[systat]\n' | nroff -U | cat -s
0
In 1.23 I get the expected "256" in both cases.
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