\pointAndClickOff
\header {
  title = "Cue notes don't work if quoted voice has a subvoice"
}
\paper { indent = 5\cm }

\version "2.13.29"

% Adding cue notes works if the quoted voice has no sub-voice
quoteMeI = \relative c' { c4 c c c | c2 r | }
\addQuote quoteMeI \quoteMeI
originalI = \relative c'' {
  c4 \cueDuring #"quoteMeI" #DOWN { r2 } c4 | c1 |
}


% Adding cue notes breaks if the quoted voice creates a sub-voice
quoteMeII = \relative c' { c4 c c c | 
  <<
    { \voiceTwo c2 \oneVoice } 
    \new CueVoice { \voiceOne \parenthesize g'2 } 
  >> r2
}
\addQuote quoteMeII \quoteMeII
originalII = \relative c'' {
  c4 \cueDuring #"quoteMeII" #DOWN { r2 } c4 | c1 |
}


<<
  \new Staff \with { instrumentName = "Working quoted" } { \quoteMeI }
  \new Staff \with { instrumentName = "Working quoting" } { \originalI }

  \new Staff \with { instrumentName = "Not working quoted" } { \quoteMeII }
  \new Staff \with { instrumentName = "Not working quoting" } { \originalII }
  
  \new Staff \with { instrumentName = "which voice quoted?" } { \new Voice {\quoteDuring #"quoteMeII" { s1*2 } }}

>>