Error in printing ff

[Friedrich Kink]

Dear Developers,

I noticed an issue which I consider a bug. I tried with latest lilypond
version  2.19.55.

The following lyrics 'un -- er -- schaff -- nen' prints 'un - er scha
nen' from a Latex file including  lilypond source with

\documentclass[a4paper, twocolumn, landscape, DIV=17]{scrreprt}%{article}
\usepackage[utf8]{inputenc}
\usepackage[a4paper,landscape,margin=15mm,columnsep=30mm]{geometry}
\usepackage{lettrine}
\usepackage[neveradjust]{paralist} % fuer liedertextlist
\usepackage{graphics,color}
\usepackage[german]{babel}
\usepackage[full]{textcomp}
\pagestyle{empty}
\begin{document}

\begin{compactenum}[\normalfont\sffamily\bfseries 1]
\item
\lilypondfile[line-width=112\mm,staffsize=15]{Gesangbuch\450.ly}
\end{compactenum}

whereas if the lyrics look like 'un -- er -- schaf -- nen' prints 'un -
er - schaf - nen' (note the missing double f). If needed below complete
lilypond source.

kind regards,
   Fritz

\include "lilypond-book-preamble.ly"
\paper{
  indent=0\mm
%  line-width=120\mm
  oddFooterMarkup=##f
  oddHeaderMarkup=##f
%  bookTitleMarkup = ##f
%  scoreTitleMarkup = ##f
}
\version "2.19.55"
global = {
   \key c \major
   \time 2/2
}
\header{
  title = "Morgenglanz der Ewigkeit"
  composer = "Text: Christian Knorr von Rosenroth"
  poet = "Melodie: Johann Rudolf Ahle 1662"
}

melodie = \relative c' {
        \global
        %\tempo 2 = 1
        \override Staff.TimeSignature.style = #'mensural
        \override Score.PaperColumn.keep-inside-line = ##t
        \override Score.LyricText.font-shape = #'italic
        \set midiInstrument = #"church organ"
        \repeat volta 2 {\partial 4*2 e4 c g' a f4. e8 e2 \breathe c'4 b
a b c b8 c a4.( g8) g2 }
        \partial 4*2 g4 g a g f e8 d d2 \breathe e4 d c2 \bar "|."
}

texta =    \lyricmode { Mor -- gen -- glanz der E -- wig -- keit, Licht
vom un -- er -- schaff -- nen _ Lich -- te, }
textb =    \lyricmode { schick uns die -- se Mor -- gen -- zeit dei --
ne Strah -- len zu Ge -- _ sich -- te}
textc =    \lyricmode { und ver -- treib durch dei -- ne _ Macht uns --
re Nacht. }

\score {
    \new Staff <<
      \new Voice = m \melodie
      \new Lyrics \lyricsto m { \texta }
      \new Lyrics \lyricsto m { \textb \textc }
    >>
    \layout {
      \context {
        \Lyrics
          \consists "Bar_engraver"
          %\consists "Separating_line_group_engraver"
          \override BarLine.transparent = ##t
      }
    }
    \midi {
      \context {
          \Staff
          \remove "Staff_performer"
      }
    \context {
      \Voice
      \consists "Staff_performer"
    }
    \tempo 4. = 90
    }
}