The fix for this issue is now available in the latest update of InDesign – version 16.1
Please update to this version to get the fix. To prevent problem on existing documents and see the footnotes again, you will have to force recompose the stories.
To force recompose stories, you can use the shortcut Command-Option-/ (slash) on Mac or Ctrl-Alt-slash on Windows
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Saved the word doc as a .doc not as a .docx. This imported fine into inDesign with the footnotes intact.