Single staff polyphony problems

[Nick Payne]

This is bar 110 from the Mertz guitar transcription of Schubert's 
Aufenthalt:

\version "2.13.28"

\relative c'' {
    \new Staff <<
        \new Voice = "one" { \voiceOne <e b g>4 r }
        \new Voice = "two" { \voiceTwo e,,4 r }
        \new Voice = "four" { \voiceFour \times 2/3 { s8 <e'' e,> <e 
e,> <e e,> <e e,> <e e,> } }
>>
}

For some reason, a) the rest in voiceOne doesn't avoid the top e in 
voiceFour without being explicitly placed (don't know why, as similar 
rests in voiceOne manage to automatically avoid notes in voiceFour in 
the couple of dozen previous bars in the piece where this construction 
occurs, and b) the horizontal spacing between the quarter notes in 
voices one and four and the first eighth note in voiceFour is so small 
as to make it seem that the notes are simultaneous.

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