footnotes in markup attached to notes not working

[Dan McMahill]

> I'm not top posting.

% The first footnote works as expected.
% the second doesn't.  The second puts the * in the markup bu
% doesn't actually create the footnote.

% Checked with version 2.19.15

\version "2.19.15"

% test 1
\markup{ \italic "(rit.)" \footnote "*" \italic "* First note about the rit." }


hornA = \relative c' {
  \key a \major
  \time 3/4 
  a4 a a | 
  % test 2
  a_\markup{ \italic "(rit.)" \footnote "*" \italic "* Second note about the
rit." } 
   a a |
}
  
  
hornPartA = \new Staff \with {
  %instrumentName = "Horn in F"
  midiInstrument = "french horn"
} {\transposition f \hornA }

\score {
  <<
    \hornPartA
  >>
  \layout { }
  \midi { }
}