Split Directive in partcombine

[Will Oram]

Try the code below (2.3.19). The output I get looks roughly like
< c e >1~ < c e >
R1*6
<< R1 \\ { s4 s s d'16( c8.) } >> %%% ?!...where is e2.?
<< g1 \\ { g2. r4 } >>

This is accompanied by, in the terminal, 'error: Unknown split 
directive: playing1
Continuing; crossing fingers'

No idea what's so offensive about the code below, so I'm turning it 
over to bugs.

-- Will

%%% code starts here %%%

PartA = {
        \clef "treble"
        \time 4/4
        \key c \major
        
        e,1~
        e
        
        R1*6
        
        e'2. d16( c8.)
        g2. r4
}

PartB = {
        \clef "treble"
        \time 4/4
        \key c \major
        
        c,1\pp~
        c
        
        R1*7
        
        g'1
}

\score {
        \simultaneous {
                \new Staff <<
                        \partcombine
                                \relative c''' { \PartA }
                                \relative c''' { \PartB }
                >>
        }

        \paper {}
}

Will Oram
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