When I call the "org-icalendar-combined-agenda-file" function,
everything works fine, I have a new "file.ics". But if you try to make
footnotes in one of the files (in org-agenda-files) taken into account in
the
org-icalendar-combined-agenda-file function, look at the end of the
resulting file "file.ics" : the footnotes are included in the .ics file,
which obviously creates a bug in the file


Emacs  : GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version
3.24.20, cairo version 1.16.0)
 of 2020-09-19
Package: Org mode version 9.4.6 (9.4.6-g069bcb @
/home/msi/.emacs.d/straight/build/org/)