Break-align-symbol has no effect

[Neil Puttock]

Hi,

In the following snippet, the rehearsal marks ignore the break-align-symbol
overrides:

\version "2.11.29"
\paper { ragged-right = ##t }
\relative c' {
    c1
    \key cis \major
    \clef alto
    \override Score.RehearsalMark #'break-align-symbol = #'key-signature
    \mark "on-key"
    cis
    \key ces \major
    \override Score.RehearsalMark #'break-align-symbol = #'clef
    \clef treble
    \mark "on clef"
    ces
}

Regards,
Neil