\version "2.11.29"
% If ragged-right = ##f, the music is spaced more broadly and the bug 
% doesn't  occur.
\paper {
        ragged-right = ##t
}

% The bracket for the middle tuplet won't be printed, despite the
% property.
\relative c' {
        \override TupletBracket #'bracket-visibility = ##t
        \times 2/3 {r8 c4} \times 2/3 {r8 c'4} \times 2/3 {r8 c c}
}