mensural ligature

[Johannes Roeßler]

Hi Group,

I try to set this ligature for an incipit:

using

\version "2.24.0"

{  \override NoteHead.style = #'mensural \[ a'1\melisma  c'' \override NoteHead.ligature-flexa = ##f a'\breve  \melismaEnd \]}
\layout {
    \context {
      \Voice
      \remove "Ligature_bracket_engraver"
      \consists "Mensural_ligature_engraver"
    }
  }

results in a flexa ligature for the end c-a instead of quadratic (which is the default according to the manual) - but even with \override NoteHead.ligature-flexa = ##f it doesn't change.

How can I achieve this?

Cheers
Joei