The flag queue lists automatically-detected duplicate answers.
According to Duplicate answers (not questions) and other
questions on MSO, there is nothing wrong with such duplicate
answers—except insofar as they are potentially indicative of a
duplicate question.  So, having verified that the answers do not
merit a flag for any other reason (and having flagged the
questions as duplicates if appropriate: although if that was the
purpose of this exercise, shouldn't the system have raised
automatic flags on the questions instead?), how should one
respond to these flags?  It seems that the only option is to
flag for moderator attention, either:    • because "I do not
agree with the existing flags on this answer, they are incorrect
and should be ignored." (invalid flag), even though I do agree
that the answers are indeed duplicates; or    • for a custom
reason.  Neither of the above really feel very appropriate.
Perhaps if the flag was instead "suspected spam" (or similar) it
would be easier to flag as being inva