Can't change Script.font-size in grace moment

[uliska]

\editionMods addressed to grace moments don't affect Script.font-size while they properly affect Script.color. (I don't know what other properties might be affected by this shortcoming:

\version "2.19.82"

\include "oll-core/package.ily"
\loadPackage edition-engraver

\addEdition test

% "Regular" mods, change 'color' and 'font-size' as expected
\editionMod test 1 0/4 test.Voice.A \once \override Script.color = #red
\editionMod test 2 0/4 test.Voice.A \once \override Script.font-size = 3

% In grace moment, only 'color' is affected, but not 'font-size'
\editionMod test 3 #(ly:make-moment 0 4 -1 4) test.Voice.A {
  \once \override Script.color = #red
  % font-size = 0 should result in the same size as the fermata in m. 1
  \once \override Script.font-size = 0
}

\new Staff {
  c'1 ^\fermata
  c' ^\fermata
  \grace d'4 ^\fermata
  c'1
}

\consistToContexts #edition-engraver Score.Staff.Voice
\layout {
  \context {
    \Score
    \editionID ##f test
  }
}