This empty inset caused problems with LuaTeX + system fonts (see
b863fb07). Although these problems seem to be resolved, this empty
inset is not supposed to be there.
\begin_inset Quotes frd
\end_inset
\begin_inset Quotes frd
\end_inset
- con tres recuadros
-\begin_inset Formula $\text{\textipa{}}$
-\end_inset
-
- personalizados.
+ con tres recuadros personalizados.
La sección
\emph on
Recuadros flexibles y formato del recuadro
La sección
\emph on
Recuadros flexibles y formato del recuadro