reledmac : stanza inside critical footnote of a stanza

Question

Here is MWE:

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[series={A,B,C,D},noend,noeledsec,nofamiliar,noledgroup]{reledmac}
\firstlinenum{1}
\linenumincrement{1}
\Xarrangement[B]{twocol}
\Xarrangement[C]{threecol}
\Xarrangement[D]{paragraph}
\setstanzaindents{3,1,2,1,2,1}
\begin{document}
    \beginnumbering
    \autopar
%   \AtEndEveryPend{\vspace{30pt}}
\edtext{Lorem}{
    \Afootnote{A critical note}
    \Bfootnote{Critical note in series B}
    \Cfootnote{Critical note in series C}
    \Dfootnote{loram}}
\edtext{ipsum}{
    \Afootnote{An other critical note}
    \Bfootnote{Other critical note in series B}
    \Cfootnote{Other critical note in series C}
    \Dfootnote{ipsam}}
dolor sit amet, consectetur adipiscing elit.
\edtext{Fusce sed dolor libero. Aenean rutrum vestibulum lacus ut pretium. Fusce et auctor lectus. Ut et commodo quam, quis gravida orci. Nullam at risus elementum, suscipit enim a, pellentesque mi}
{\lemma{Fusce\ldots mi}
    \Afootnote{A long critical note}
    \Bfootnote{Again B}
    \Cfootnote{Again C}
    \Dfootnote{omit}}.
Morbi commodo, ligula vel consectetur accumsan, \\massa metus egestas velit, eu fringilla leo ante in turpis. Vivamus ut tellus sollicitudin, facilisis ipsum sit amet, \\tincidunt odio. Maecenas tincidunt dolor sed ante blandit tincidunt. Etiam vulputate ultricies facilisis.\\
Morbi commodo, ligula vel consectetur accumsan, massa metus egestas velit, eu fringilla leo ante in turpis. Vivamus ut tellus sollicitudin, facilisis ipsum sit amet, tincidunt odio. Maecenas tincidunt dolor sed ante blandit tincidunt. Etiam vulputate ultricies facilisis.

\pstart%[\centering]
    Morbi commodo,\\
    ligula vel consectetur\\
    accumsa
\pend

massa metus egestas velit, eu.
facilisis ipsum sit amet, tincidunt odio. Maecenas tincidunt dolor sed ante blandit tincidunt. Etiam vulputate ultricies facilisis.\par
\stanza[\centering]
fringilla leo&
ante in turpis.&
\edtext{Vivamus}{%
    \lemma{}%
    \Afootnote{%
        \stanza[\centering]
        ligula vel consectetur accumsan,&
        massa metus egestas velit, eu fringilla leo ante in turpis.&
        Vivamus ut tellus sollicitudin,&
        facilisis ipsum sit amet, tincidunt odio.\&%
    }%
}
facilisis ipsum sit&
ut tellus sollicitudin,\&

facilisis ipsum sit amet, tincidunt odio. Maecenas tincidunt dolor sed ante blandit tincidunt. Etiam vulputate ultricies facilisis.

\endnumbering

\end{document}

Here we have a stanza starting in line 46. The stanza is centered. It has 4 lines. The third line contains a critical footnote. The critical footnote contains a stanza of 4 lines.

Here if I define \setstanzaindents{3,1,2,1,2}, the compilation fails, telling me that indentation of 5th line was not defined. If I define 5th line as \setstanzaindents{3,1,2,1,2,1}, then compilation succeeds. But,after doing multiple runs with latexmk, I've observed that the sometimes the third line of the stanza is not printed and sometimes when it is printed the reference number in footnote is 0 and footnote stanza are numbered as 22, 23, 24, 25 and these line numbers are missing from main text portion.

Please, check attached screenshots of two separate multiple runs with latexmk.

1st Run with latexmk:

2nd Run with latexmk:

Answer 1

As @Maïeul wrote, reledmac does not allow the use of numbered text within footnotes; this includes \stanza.

Still, you can simulate a stanza with a series of lines with manual line breaks. If it needs to be centered, you can use \centering, which requires braces and some kind of line break at the end. \par is forbidden in critical footnotes, so you want something like

{\centering
...
\\}

As you mentioned in a comment, there are two challenges: unwanted vertical space at the end (because we used \\) and the wrong position of the footnote mark, which is also centered instead of left-aligned. Here's how I would go about it; it's a bit ugly, but it works.

First step:

\edtext{}{%
\lemma{}%
\Afootnote{%
\flushleft
{\centering
ligula vel consectetur accumsan,\\
massa metus egestas velit.\\}%
}}

\flushleft makes the whole footnote left-aligned and fixes the position of the line number. And within the left-aligned footnote, we insert a block of centered text via {\centering ... \\}. Like this:

Notice the correct alignment of the line reference.

But we've still got one line of unwanted whitespace at the end, plus an additional "empty" line right after the line reference. Here's a solution to remove these lines:

\edtext{}{%
\lemma{}%
\Afootnote{%
\flushleft\vspace{-\baselineskip}
{\centering
ligula vel consectetur accumsan,\\
massa metus egestas velit.\\[-\baselineskip]}%
}}    

(\\[<length>] exploits the optional argument of \\. \baselineskip is a scalable length that gives the current height of a line. We're telling the program: "print the next line exactly on top of this one".) Here's the result:

This solves both issues.

Finally, you need to set the individual line indents manually, using appropriate \hspace{}s according to your preferred scheme. The integers in \setstanzaindents are multiples of 20pt, but you should choose a smaller value because of the text size in the footnotes (\footnotesize). How much smaller depends on your document class.