Multimeasure rests not compressed

[Davide Liessi]

Dear all,

in the following example I expected to see two identical scores, but
in the first one the full bar rests after the rehearsal mark are not
compressed.

\version "2.19.82"

\score {
  \compressMMRests
  \new Staff <<
    {
      s1*5
      \mark \default
    }
    {
      c'1
      R1*10
      c'1
    }
  >>
}

\score {
  \compressMMRests
  \new Staff {
    c'1
    R1*4
    \mark \default
    R1*6
    c'1
  }
}

Is there a solution?

Best wishes.
Davide