EMACS lilypond mode: possible bug

[plutek]

with this score in EMACS:

\score {
        \notes { f16 g a b c[ < d f >]
}
\paper {}
}

EMACS claims that the closing parenthesis of the \notes block is
mismatched, and if i put in a second line of notes it wants to indent to
the < of the first line.

if i move the ] inside the chord like: < d f] > then EMACS thinks
everything is fine. of course, then the beam is unterminated for lilypond.

do other folks observe the same behaviour?
i'm on lilypond 1.9.8, GNU EMACS 21.2.1

-p