Adding a marginal note renders extra staves

[adunning]

Gregorio 5.2.1 has rendering problems when attempting to add a marginal note using the marginnote package (\marginpar results in an error):

\documentclass{article}

\usepackage{gregoriotex}
\usepackage{marginnote}

\begin{document}

\gabcsnippet{(c3) Test(h) <v>\marginnote{marginal note}</v> mu(h_)sic(g_)}

\end{document}

[rpspringuel]

I think this is probably caused by the same thing causing the problems in #1500. The marginal note ends up inside a box and gets processed multiple times. There also seems to be an invocation of \localleftbox inside the margin note.

In this case, since there's nothing visible in the score itself, you might try using the verbatim macros in the notes instead: http://gregorio-project.github.io/gabc/details.html#verbatim

[adunning]

Might it be possible to add a macro for marginal notes into Gregorio itself? It's a reasonably common feature in chant sources.