The preprocess function and grep work correctly. The problem is the current directory is processed once before the preprocess function is called - you can verify by adding a debug print 
preprocess => sub { print "preprocessing [@_]";
                    return grep -f $_ && -M _ < 1, @_
                  }

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In reply to Re: File test in grep not excluding current directory by choroba
in thread File test in grep not excluding current directory by GotToBTru

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