Follow-up Comment #3, bug #67978 (group groff): Getting a minimal reproducer is going to require some digging; the problem appears to be state dependent, and the formatter is sure to be in a pretty weird state given the absurd input.
$ sed -n '4026p' ~/src/sed-4.8.tar.xz | ./build/test-groff -Ww -z && echo
success
troff:<standard input>:1: error: ignoring invalid numeric expression starting
with character code 225
success
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