I have a document of about 250 pages, and it has a few dozen footnotes. These were created using “Insert->Footnote and Endnote”->“Footnote or Endnote…” and the character I used to denote them was an asterisk.
Recently, when I opened the document, I noted the majority of the footnotes have disappeared. Not all, but maybe around 80 to 90 percent of them. In all instances I can see of missing footnotes, the footnote at the bottom of the page has been removed, but the asterisk character that marks the point in the text being footnoted remains. It just isn’t connected to anything.
I looked online, and one suggestion was that saving back and forth between other formats, such as Word .DOCX or .DOC or others could be the root of the problem. However, i have only ever saved this document as a .ODT. I exported it a couple times as PDF for others to read, but I always kept the original in .ODT format.
Also, in one forum post, a person with the same problem said they eventually found all their footnotes at the very bottom of the document. Unfortunately, I checked, and the missing footnotes are not aggregated at the bottom or anywhere else that I can find.
The only thing I can think that might have had an impact is that in the time between when I last saw the footnotes and when I noticed they were missing, I upgraded LibreOffice from 6.3 to 7.0.1.
Why are footnotes disappearing, can I recover them, and how do I prevent this from happening again?