#ftn.[][]
ERROR: A footnoteref element has a linkend that points to an element that is not a footnote.
Typically this happens when an id attribute is accidentally applied to the child of a footnote element.
target element:
linkend/id: #ftn.[]ftn.#
[]
ftn.#[]
The following annotations are from this essay. You are seeing
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Warning: footnote number may not be generated correctly; unexpected as first child of footnote.