length of stems of sextuplets is too short

[Marc Mouries]

As you can see on this snippet the length of stems of sextuplets is too short. The length of the stems extend for 32th but not for the 8th notes.

Is there anything i should do or is there something wrong is the default values?

%% the sextuplets look compressed. The stems are too short.

\version "2.13.60"

\language "english"

\paper{ ragged-right=##t }

\relative g' {

    \key a \major

    \times 2/3 {e'8 gs a}  \times 2/3 {b a gs}

    \times 4/6 {e16 gs a b a gs}

    \times 4/12 {e32 gs a b a gs   e32 gs a b a gs}

}

bug_sextuplet.ly
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