Punctum Decendens not being used in fused neume

[rpspringuel]

-er@h> produces:

\GreSyllable}{\GreSetNoFirstSyllableText}{}{\GreUnstyled}{1}{\GreSetNextSyllable{}{}{}{}{}}{}{{0}{0}}{}{%
\GreSyllableNoteCount{2}%
\GreGlyph{\GreCavum{PunctumThreeInitioDebilisUp}}{7}{\GreNextCustos{10}{}}{0}%
{%
\GreGlyphHeights{7}{7}%
}{}{}%
\GreEndOfGlyph{1}%
\GreFuse\GreGlyph{\GreCPPunctumLineBL}{10}{\GreNextCustos{7}{}}{0}%
{%
\GreGlyphHeights{10}{10}%
}{}{}%
}

When it should produce

\GreSyllable}{\GreSetNoFirstSyllableText}{}{\GreUnstyled}{1}{\GreSetNextSyllable{}{}{}{}{}}{}{{0}{0}}{}{%
\GreSyllableNoteCount{2}%
\GreGlyph{\GreCavum{PunctumThreeInitioDebilisUp}}{7}{\GreNextCustos{10}{}}{0}%
{%
\GreGlyphHeights{7}{7}%
}{}{}%
\GreEndOfGlyph{1}%
\GreFuse\GreGlyph{\GreCPPunctumDescendens}{10}{\GreNextCustos{7}{}}{0}%
{%
\GreGlyphHeights{10}{10}%
}{}{}%
}

Note the substitution of \GreCPPunctumLineBL for rendering h> which should be \GreCPPunctumDescendens. I have not yet looked at the source to see if I can determine why this problem occurs.