HaraKiri and staff-consisted marks

[Nicolas Sceaux]

Hello,

In the following score, using \RemoveEmptyStaffContext, the marks are
said to be rebuted, and thus not displayed:

\paper {
    raggedright = ##t
    \context {
        \Score
        \remove "Mark_engraver" 
    }
    \context {
        \Staff
        \consists "Mark_engraver"
    }
    \context { \RemoveEmptyStaffContext }
}

\score {
    \new StaffGroup <<
        \new Staff <<
            { \mark "Allegro." }
            { e'4 f' g' a' \break c' d' e' f' }
        >>
        \new Staff <<
            { R1 c'1 }
        >>
    >>
}

Marks are removed from the score context and added to the staff
context. If \RemoveEmptyStaffContext is removed, the marks are
correctly displayed.

What am I missing?
I'm using LilyPond from CVS.

thanks
nicolas