connect arpeggio down

[Helge Kruse]

I have a problem with  connecting arpeggio. The arrow of
\arpeggioArrowDown or -Up vanishes when I connect the arpeggios of two
staves. You can reproduce it with the example below. Comment out the
connectArpeggios line and you see arrows.

Is this a known bug?

Regards Helge


\version "2.18.0"

upperHarpII = \relative c'' {
  \arpeggioArrowDown  <b c>2\arpeggio r
}
lowerHarpII = \relative c' {
  \clef bass
  \arpeggioArrowDown  <a e a,>2\arpeggio r
}

\score {
  \new PianoStaff \with {
    connectArpeggios = ##t
  } <<
    \new Staff \upperHarpII
    \new Staff \lowerHarpII
  >>
}

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