Wrong grace note output

[nullplan (sent by Nabble.com)]

Hi all,
I tried to use the following code today:
\new PianoStaff <<
  \new Staff <<
    \repeat volta 2 { foo bar }
    \alternative { 
      \grace a8 a'4 r8. g,16[ c8. e16]\bar "||"
    }{
      \grace a8 a'4 r4 r
    }
  >>
  \new Staff << foo bar >>
>>

After compiling this code I don't get grace notes but accords like <a8 
a'>. Any workaround known?
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