Issue with cropped PNG export in version 2.26.0

Hi everyone,

I use LilyPond (via Frescobaldi) to create small sheet music snippets
without any surrounding whitespace, which I use in my classes as a music
teacher.

Until recently, I was using version 2.24.4, where the following snippet
gave me the desired output:

--

% Version number
\version "2.24.4"

% Export as a small image without whitespace
\include "lilypond-book-preamble.ly"
%#(ly:set-option 'separate-page-formats 'png) % each staff line in a new
file
#(ly:set-option 'tall-page-formats 'png) % all staff lines in a single file
% End of export snippet

--

I have recently updated LilyPond to the latest version (currently 2.26.0),
and the code above no longer works as expected.

I have attached a code example that I typically use, along with the desired
output (generated with version 2.24.4) and the current output I am getting
with version 2.26.0.

I am looking for the correct code or settings to include so that I can once
again export perfectly cropped PNGs via Frescobaldi, containing one or
multiple staff lines in a single file.

Please note that I use LilyPond and Frescobaldi on both Windows 11 and
macOS, and I do not use the command line due to restrictions on my work
devices.

I would be very grateful if anyone on this mailing list could help me find
a solution. Thank you in advance for your time and help!

Best regards,
Lodewijk