8th triplets in 3/4 beaming?

[Mike Blackstock]

This:
\relative c' {
        \time 2/4
        \times 2/3 {c8 c c }
        \times 2/3 {c c c }
}

gives me this, as expected: http://www.vex.net/~mikeb/ex2-4.png
(beam connecting 3 triplets then a new beam)

but this, in 3/4 with 3 triplets:
\relative c' {
        \time 3/4
        \times 2/3 {c8 c c }
        \times 2/3 {c c c }
        \times 2/3 {c c c }
}

gives me this, with beams all  connected: http://www.vex.net/~mikeb/ex3-4.png

Every time signature but 3/4 gives me the expected result - beam
connecting 3 triplets, then a new beam.
Am I missing something obvious?

Lilypond 2.13.11 on Ubuntu 9.04