\partCombine problem with spanners

[Miguel Jesus]

2nd note should be marked "Solo". Instead, both the note and the full measure 
rest appear.Do you think this might be related to issues 4095 and 4454?


\version "2.19.25"
one = \relative c' {    c1\< | f\mf  }
two = \relative c' {    c1\< | R\! |  }
\score {
  \new Staff { \partcombine \one \two }
}

Thanks,Miguel