NoteColumn.horizontal-shift not working

[Robert Garrigos]

Hi,

Why NoteColumn.horizontal-shift is not working here as usual?

%%%%%%%
\score {
  \relative c' {
    <<
      \new Voice {
        \voiceOne r4 <ef f c' ef>4
        % per què no funciona aquí això?
        \once \override NoteColumn.horizontal-shift = #1
        <d d'>4._( <c c'>8)
      }
      \\
      \new Voice{
        \voiceTwo s4 s4
        \once \override NoteColumn.horizontal-shift = #-1
        <f bf>4 <ef af!>
      }
    >>
  }
}
%%%%%%%%


this doesn’t move in any case

Thanks.

Robert