In tracking down another problem with the latest version of org (more to follow probably), I thought using org-lint might help. With the attached simple example, I get:
5 high Missing definition for footnote [1]
from org-lint.
The footnote definition is there as it's inline...
--
: Eric S Fraga via Emacs 26.0.50, Org release_9.0.9-796-gbae41a
#+TITLE: examplebug.org #+AUTHOR: Eric S Fraga * Link to maxima We can use Maxima to solve our equations.[fn:1: http://maxima.sourceforge.net/] #+index: modelling!tools
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