RemoveEmptyStaffContext doesn't remove from first sytem

[Bertalan Fodor]

%BUG: RemoveEmptyStaffContext doesn't remove staff from the first sytem

\version "2.5.26"

\score {
   \relative <<
   \new Staff { R1       | R1 \break R1      | R1 \break c4 d e f | g f 
e d }
   \new Staff { a4 b c d | e d c b | a b c d | e d c b | a4 b c d | e d 
c b }
   >>
   
   \midi {
   }

   \layout  {
       \context { \RemoveEmptyStaffContext }
   }
}

\paper {
}