Gould illustrates this happening for beamed quavers (page 64), but doesn't address this exact case of crotchets that I can find.
Paul From: Simon Albrecht <simon.albre...@mail.de> To: Lilypond bug list <bug-lilypond@gnu.org> Sent: 28/02/2023 11:41 Subject: Melody_engraver and tied notes Hello everyone, Melody_engraver readily sets different stem directions either side of a tie. I don’t think it should do that. %%%%%%%%%%%%%%%%%%%%%%%%% \version "2.25.2" \layout { \context { \Voice \remove Note_heads_engraver \consists Completion_heads_engraver \consists Melody_engraver } } \relative { d''2. b4~ 4 g2 b2 d2. } %%%%%%%%%%%%%%%%%%%%%%%%%% Technically, not a minimal example, since Completion_heads_engraver isn’t really related. I just figured I include it to be safe, in case behaviour differs in any way with regard to potential fixes. Best, Simon