autoBeam and slurs in tab

[Éric]

Hello,
slurs in polyphonic tab are badly impacted by autoBeam  Off/On
Looks related to issue #3542 but I'm not able to understand more. 
My short code : 

\version "2.19.60"

voiceA = {
  \time 2/4
  \voiceOne
  e'2  2
}

voiceB = {
  \voiceTwo
  e8( fis)
  \autoBeamOff
  g8( a)
  \autoBeamOn
  e8( fis) g( a)
}

\score {
  <<
    \new Staff \with { \clef "G_8" }
    <<
      \new Voice \voiceA
      \new Voice \voiceB
    >>

    \new TabStaff
    <<
      \new TabVoice \voiceA
      \new TabVoice \voiceB
    >>
  >>
}


Yours
Éric




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