I have a single indd-document containing a book with 300+ footnotes in it. I have set the footnote numbering to "Restart numbering at every --> Section" (i.e. Chapter).

But when I export the document to an EPUB file, InDesign does not heed this setting but keep running the numbering up to "348".

I suspect this is a bug in inDesign 2020 (15.0.1), as there seem to be no good reason for this behavior.