\score {
  <<
    \new Staff \notes\relative c'' {
      R1
      % Measure rests ok
      c4 << {f4 d e R1} \\ {b4 c2} >>
      R1
      % Measure rest not ok
      \voiceOne
      c4 f4 d e
      \oneVoice
      R1
    }
    \new Staff \notes\relative c'' <<
      % Last measure rest not ok
      \new Voice {R1 c4 \voiceOne f d e R1 \oneVoice R1}
      \new Voice {s1 s4 \voiceTwo b c2}
    >>
  >>
  \paper{}
}