Follow-up Comment #2, bug #68257 (group groff): Also, in numeric expressions, while a closing brace escape sequence **does** effectively terminate the expression, its presence produces a warning since _groff_ 1.24.0.
$ printf '.nr a 1+1\}2\n.tm \\na\n' | ~/groff-1.23.0/bin/nroff -ww
2
$ printf '.nr a 1+1\}2\n.tm \\na\n' | ~/groff-1.24.0/bin/nroff -ww
troff:<standard input>:1: warning: expected end of line or an auto-increment
argument in register definition request; got an escaped '}'
2
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