problem with global-staff-size and book bloks

[Reuben Kagan]

Hi,

here is my example :
\version "2.22.2"
%file NOTES.ly

 #(set-global-staff-size 10)
 NOTES = \relative c'' {
   \key d \minor \time 3/4
   a bes c d e f
 }

 \score {
   \new Staff \NOTES
 }

 \book {
 #(set-global-staff-size 30)
  \bookOutputName "NOTES BIG"
   \score {
   \new Staff \NOTES
 }
 }

and I would expect that NOTES.pdf would have the score in small font and
the NOTES BIG.pdf the same in big font . but it is the other way around.
what, what could I do?

(I usually add book blocks to existing files to make some custom versions)
Thanks,
Reuben.