Unmangling score-final tuplet brackets

\new Staff {
   \set tupletFullLength = ##t
   \time 1/8
   \times 2/3 { c'16 c'16 c'16 }
   \times 2/3 { c'16 c'16 c'16 }
   \times 2/3 { c'16 c'16 c'16 }
   \override Score.RehearsalMark #'break-visibility = ##(#t #t #t)
   \override Score.RehearsalMark #'direction = #down
   \override Score.RehearsalMark #'break-align-symbol =  #'clef
   \override Score.RehearsalMark #'self-alignment-X = #right
   \mark "Composed Feb 2007 - Feb 2008"
}

Note that you can now get this to work with the following:

\override TupletBracket #'full-length-to-extent = ##f

From the LilyPond bug in the tracker here.