Issue with deep-copy/map-some-music a tuplet

[Paolo Prete]

Hello,

I just noticed an inconsistent behavior with 2.25.0. The snippet below
doesn't compile; I don't know if there is a hidden problem inside it, but
it worked for all the versions prior to 2.25:

%-------------------------------------------------------------------

test = #(define-music-function (parser location music) (ly:music?)
(let
  ((musiccpy '()))
  (begin

    (set! musiccpy (ly:music-deep-copy music))

    (map-some-music (lambda (evt)
      (let ((nameUp (ly:music-property evt 'name)))
        (cond
          ((eq? nameUp 'NoteEvent)
              (set! evt '())
            evt)
          (else #f))
        ))
    musiccpy)

 )
#{ $musiccpy #}))

{
  \test { \tuplet 3/2 { e'8 s  s } }
}

%-------------------------------------------------------------------

Some observations:

1) the snippet compiles if the tuplet is removed
2) the snippet compiles if map-some-music is don on $music, instead of
$musiccpy

I don't know if it's a bug, but in any case, is there a way/workaround to
fix it while preserving both ly:music-deep-copy and the tuplet?

Thanks and Merry Christmas!

Paolo