Rest position problem

[Jefferson dos Santos Felix]

I have a problem with automatic rest position in multi-voice songs when 
I use Staff.verticalExtent.
For example:

\version "2.3.11"

\score
{
  \relative
  {
      <<
          \new Staff
          {
              \clef treble
              \set Staff.verticalExtent = #'(-10 . 10)
              \partial 4 <<g'4\\r>> |
              <<{e4. g8 g4 e}\\{r8 c c4 c2}>>
          }
                    \new Staff
          {
              \clef bass
              \set Staff.verticalExtent = #'(-10 . 10)
              \partial 4 r4 |
              c,2 c4 c
          }
      >>
  }
}

This file produce wrong rest positions (collision between rests and 
notes). When I comment the line:
 \set Staff.verticalExtent = #'(-10 . 10)

Lilypond produce correct rest positions, but I want to use this function 
to extend my staff!
What's the problem?

Jeff