Keys won't display as text in saxophone diagram

[Antonio Ortega Brook]

Hello everyone. First of all I think maybe I misunderstood the instructions
for bug reporting and I've opened an issue in GitLab before posting to this
list and now I think that I might not be supposed to do that. I'm very
sorry for the inconvenience.
Anyway, I get the following error when trying to display key names in a
saxophone diagram:

/Applications/LilyPond.app/Contents/Resources/share/lilypond/current/scm/display-woodwind-diagrams.scm:1773:55:
Wrong type argument in position 2 (expecting list): #f
Exited with return code 1.

Example:

\version "2.20.0"

fingering = \markup \override #'(graphical . #f) {
\center-column {
\woodwind-diagram
#'saxophone
#'((cc . (one two four five six))
  (lh . (b))
  (rh . (ees)))
}
}

\score {
<a' aih''> ^\fingering
}

Attached is the expected result.
Best regards
-- 
Antonio

expectedResult.png
Description: PNG image