Follow-up Comment #1, bug #61019 (project groff):
This is the result of a bad programming practice;
macros are not initialised before they are used.
The message:
troff: EXPERIMENTS/pic.me:2: warning: macro '&&' not defined
is the clue.
'&&' is here used as a "terminating macro" (when '..' can't be used),
thus it must exist when it is encountered.
Defining it as empty is enough,
or one could put a diagnostic message in it.
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