Double-Printing of Accidentals

Accidentals that overlap exactly should be printed only once. But LilyPond
currently prints them twice. You can see that this is happening if you use
Frescobaldi, zoom your Music Viewer in, and then comment out
\once \omit Accidental

in the MWE below.

(See https://lists.gnu.org/archive/html/lilypond-user/2025-12/msg00313.html
for context.)

%%% MWE begins
\version "2.24.4"

\new Staff <<
  \new Voice =3D "first"
    \relative c'' { \voiceOne beses beses! }
  \new Voice =3D "second"
    \relative c'' {
      % If you comment out the following line,
      % the accidental will get bolder/darker in Frescobaldi=E2=80=99s PDF =
viewer:
      \once \omit Accidental
      \voiceTwo beses
    }
>>
%%% MWE ends


---------- Forwarded message ---------
From: Werner LEMBERG
Date: Wed, 31 Dec 2025
Subject: Re: Accidentals: Perfect Unison across Two Voices
Cc: <[email protected]>

I agree that accidentals that overlap exactly should be printed only once.
I can't find an issue in our bug tracker for this problem, so please open a
new issue.