fmn in combination with Lightweight Accordion

When I use the modern footnotes inside a Lighweight Accordion unit the footnote/ref does not get added into the general ‘References and footnotes’ list at the bottom of my page. Although the presented numbering continues, I have noticed the keys of the mfn elements start at 1 inside the accordion. I suspect this causes that the element doesn’t get picked up for the reference list. Or that something else in the html markup makes it impossible for the mfn to get picked up.

I can’t figure out how to solve this. Although it is not critical for me to have the references added to the main list, it would make things more complete. Anyone any thoughts?