\set Lyrics.associatedVoice is not respected for MIDI output
When processing the following example with the latest master code, the second syllable does not appear in the MIDI file.
\version "2.21.6"
\header {
texidoc = "It is possible to switch the voice that @code{\\lyricsto}
follows."
}
\layout {
indent = 0
ragged-right = ##t
}
music = \fixed c' <<
\new Staff <<
\new Voice = Va \with \voiceOne { f4 s }
\new Voice = Vb \with \voiceTwo { s4 e' }
>>
\new Lyrics \lyricsto Va {
\set Lyrics.associatedVoice = Vb
Hoo hah.
}
>>
\score {
\music
\layout {}
\midi {}
}