as a workaround you can add \override Score.BarNumber.Y-offset = #3
\score {
\new ChoirStaff <<
\new Staff <<
%% add
\override Score.BarNumber.Y-offset = #3
%%
\clef treble \global
\new Voice { \ss }
>>
\new Staff <<
\clef treble \global
\new Voice { \aa }
>>
\new Staff <<
\clef "treble_8" \global
\new Voice { \tt }
>>
\new Staff <<
\clef bass \global
\new Voice { \bb }
>>
>>
\layout { }
}
HTH
Stephen
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