Ending volta problem with ChoirStaff

[Dmytro O. Redchuk]

Hello,

    first thing -- thank you all who makes lilypond better and better :-)

    It is fantastic :-)
    (after some finale and a lot of plain musixtex)


    Well, i run into a problem with ending volta -- see file attached,
    ending volta continued after line break, but this continuation
    disappears if i uncomment additional staves (see \score { ... }
    section). So, there is no ending volta continuation after line break
    if i have more than one staff... or, probably, problem is somewehere
    in another place.

    Sorry for, probably, too verbose example.

    What's wrong? -- please, help.

-- 
  _,-=._              /|_/|
  `-.}   `=._,.-=-._.,  @ @._,
     `._ _,-.   )      _,.-'
        `    G.m-"^m`m'        Dmytro O. Redchuk