Here, if I use ordinary notes instead of grace notes, with proportional notation enabled, the beaming produces notes in the wrong order. So, this example, in which I have finally been able to prod the issue into appearing, grace notes don’t actually come into it, they are all plain ordinary music notes.
Using version 2.19.25. \version "2.19.25" %\include "/home/andro/lib/lilypond/music-functions.ily" treble = { \clef treble \time 1/4 s4 << { \tuplet 3/2 { b4 g'8 } | } \new Voice { \stemDown dis16 g16. bes | } >> s } bass = { \clef bass \time 1/4 c,4 \stemDown << { cis,,16. b,,8 d,32 } \new Voice { s16. s8 \tuplet 3/1 { \once \override NoteColumn.force-hshift = #0 d,32 bes, \change Staff = "treble" \stemDown e' } } >> \oneVoice bes,, c, bes,, a,, } \score { \new PianoStaff << \new Staff = "treble" { \treble } \new Staff = "bass" { \bass } >> \layout { \context { \Score proportionalNotationDuration = #(ly:make-moment 1/32) \override SpacingSpanner.uniform-stretching = ##t \override Score.SpacingSpanner.strict-note-spacing = ##t } } } ==== Andrew
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