header properties not visible within score

[Markus Rother]

% Embedding \fromproperty in a \score is not working (at least not) for
header properties.
% If header scope is hidden by design, how can I achieve the following?
% Many thanks and best regards, Markus
\book {
  \paper {
    indent = 0\mm
    scoreTitleMarkup = \markup {
      \fromproperty #'header:piece % works as expected
      \score {
        { s^\markup { "FOO" \fromproperty #'header:piece "BAR" } } %
property not visible
        \layout {}
      }
    }
  }
  \score {
    { s1 }
    \header {
      piece = "MENUET"
    }
  }
  \score {
    { s1 }
    \header {
      piece = "RONDEAU"
    }
  }
}

pEpkey.asc
Description: application/pgp-keys