grace plus repeat ending bug?

[Kieren Richard MacMillan]

[ Mac OS X 10.3.5; Lilypond 2.3.13 via Fink]

Hello, all!

Just wondering if this is a bug, or if I'm doing something wrong...

NOTE: The "unexpected thing" only happens when the global stuff and the 
notes are split into two blocks; when the volta definition is in the 
same block as the grace notes, it works as advertised.

Thanks!
Kieren.

____________________

\version "2.3.12"
#(set-global-staff-size 19)

theNotes =
\context Voice \relative c'
{
    c4 c c c
    \grace { e16[^( d] } <c>1)
    \grace { a16[^( b] } <c>1)
}

globalStuff =
{
    \repeat "volta" 2 { s4*4 }
    \alternative { { s4*4 } { s4*4 } }
}

\score
{
    << \theNotes \globalStuff >>
    \paper
    {
        papersize = letter
        raggedright = ##f
        raggedbottom = ##t
        pagenumber = no
    }
}