Did you mean to insert a URL to show an example?;
or did you attach an example? (if so, attachments are not allowed
so was deleted before arriving on this list)
So without seeing the example, I'm making a couple assumptions -
which may or may not apply
(1) Did you insert these footnotes manually as you did the regular
text?;
(if so, I have no clue as to why all the text would not
convert to MsFt's product)
or (2) did you set the footnotes through LO's set-up?;
(if so, I suspect that this version of MsFt is again denying
compatibility with LO)
(3) when you refer to 'sequentially numbered footnotes' does that
mean your footnotes were on a separate page(s) rather than at the bottom of
each' respective page?
(if a separate page, then I don't have a clue as to why MsFt
wouldn't handle this page as any other;
if on separate, respective pages, then only MsFt might know
why they do not wish to be compatible with others)