Manual rest placement bug

[Geoff Horton]

\include "english.ly"
\version "2.8.0"

topRight = \relative c' {
  \key a \major
  \time 4/4
  fs2 \clef bass cs
  d b |
  \oneVoice d,1\rest \voiceOne
}

\score {
  \context Staff {
    \context Voice {
      \voiceOne \topRight
    }
  }
}

========================

The manually positioned clef ignores the bass clef and places the rest
(in the wrong octave) as if it were on a treble clef instead (you can
verify this by changing the d,1\rest to fs1\rest).

Geoff