\cadenzaOn + accidental-style not working

[Wasil Sergejczyk]

when i set \cadenzaOn, set-accidental-style has no effect. do i use it correctly? is it a bug or a feature? are there any workarounds?

> \version "2.15.36"
> \include "italiano.ly"
> global = {
>   \cadenzaOn
>   \key do \major
>   \autoBeamOff
>   \pointAndClickOff
>   \override Staff.NoteHead #'style = #'altdefault
>   #(set-accidental-style 'forget)
> }
> melody = {
>   \global
>   \clef "alto"
>   \transpose do do' {
>     do re mi fa sol la sib do' sib
>   }
> }
> \score {
>   <<
>     \new Staff { \melody }
>   >>
>   \layout {
>     %indent = 0
>     \context {
>         \Staff
>         \remove "Time_signature_engraver"
>     }
>     \context {
>       \Score
>       \override BarNumber #'transparent = ##t
>     }
>   }

thanks in advance.

-- 
Best regards.