\set fontSize doesn't effect beams and stems (but noteheads and flags (!) and markups)

[Werner]

Also in a part set to a smaller fontsize

\set fontSize = #-1 {
\mark A
r8^\markup "Frage" b es8.[ b16] c g8. r4  |
}
\set fontSize = #-4 { 
r8^\markup "Antwort" b b[ b]  b16 c8. r4  | 
}
\set fontSize = #-1 {
\bar ":|" \break
}
% (With fontsize -1 in general I want to get a „less black“ paper.)

the beams and stems remain huge while noteheads, flags and markup-texts really
became smaller.

Seems to be a bug (different behavior for hooks and beams!).

greetings

Werner