The attached file, when exported to ODT fails to open in LibreOffice
exporter.  The reason failure is that the exported __XML__ file has
"nested footnote definiton" i.e., a footnote definition within a
footnote definiton.  In concrete terms, there is some confusion wrt
the return value of `org-export-footnote-first-reference-p'.

(Hint: Start with `org-odt-footnote-reference'.  If my hunch is right,
the `org-export-data' invocation there may also need a fix).

I will be happy to circulate a patch to ox-odt.el.