Avoid double beaming

[Jogchum Reitsma]

Hi,

In below snippet, lilypond renders two beams for the two voices, and, 
because I want the stems to have the same direction,
the result for the 8th-notes is that they seem to be 16th notes.
Is there a way to avoid this, and to join the two beams to one?

Thanks in advance!,

regards, Jogchum

\version "2.24.0"

global = {
  \key c \major
  \time 3/4
}

sopranoVoice = \relative c'' {
  \global
  \dynamicUp
<<
    \new Voice { << { \voiceOne
                      r8 a^\p a4. g8 \time 2/4
                      f g a a


                    }
                    \new Voice { \voiceTwo
                                 \stemUp
                                 r8 f f4.(e8)
                                 d e f f
                    }
                 >>
                 \oneVoice
    }
>>
}

\score {
  \new Staff \with {
    instrumentName = "Sopraan"
    shortInstrumentName = "S."
  } { \sopranoVoice }
  \layout { }
  }