Beaming rules in 2.13.4

[Nick Payne]

It's nice now to be able to have per-Voice beaming rules, but there 
seems to be a problem with the beaming defaults. See attached. The 
eighth notes in the middle voice are getting all beamed together unless 
an override is used.

Nick

\version "2.13.4"

#(ly:set-option 'delete-intermediate-files #t)

\pointAndClickOn

treble = \relative c' {
        f,32 d a'' d,, f d a'' d,, f d a'' d,, f d a'' d,, f d a'' d,, f d a'' 
d,,
        \overrideBeamSettings #'Voice #'(3 . 4) #'end #'(((1 . 32) . (4 4 4 4 4 
4))) 
        f d a'' d,, f d a'' d,, f d a'' d,, f d a'' d,, f d a'' d,, f d a'' d,,
}

bass = \relative c {
        d,4 r d
        d r d
}

middle = \relative c {
        f8 f f f f f
        \overrideBeamSettings #'Voice #'(3 . 4) #'end #'(((1 . 8) . (2 2 2))) 
        f f f f f f
}

\score {
        <<
                \context Staff = guitar {
                        \set Staff.connectArpeggios = ##t
                        \clef "treble_8"
                        \key d \minor
                        \time 3/4
                        <<
                                \context Voice = "1" { \voiceOne \treble }
                                \context Voice = "4" { \voiceFour \bass }
                                \context Voice = "2" { \voiceTwo \middle }
                        >>
                }
        >>
        \layout {
                \context {
                        \Staff 
                                \consists "Span_arpeggio_engraver"
                }
        }
}