cues with lyrics

[waterhorse]

This is an example that I reduced from a snippet.
Can someone please tell me why the lyrics ("wordc") don't show up on 
the third note (from the 2nd cueDuring)?

TIA,

Paul


\version "2.19.83"

vcNotes = \relative{ c'1 a d }
\addQuote qvc \vcNotes

oboeNotes = \relative{
  \cueDuring qvc #down R1 a'1 \cueDuring qvc #down R1
}

\addQuote oboeNotes
  \new Voice = "cue"
  \oboeNotes

words = \lyricmode{
  worda wordb wordc
}

<<
  \new Staff
    \new Voice \oboeNotes
    \new Lyrics = "cueLyrics"
      \lyricsto "cue" {
        \set fontSize = #-4
        \words
      }
> >