The issues seem to have been fixed upstream and the exports now
succeed on TeX Live 2021.
# See ML thread:
# https://www.mail-archive.com/search?l=mid&q=60ee3809d30056c191d4b2e8c57a7eda60b3e382.camel%40lyx.org
export/templates/Articles/Hebrew_Article_%28KOMA-Script%29_(dvi3|pdf5)_systemF
-#
-# This error could probably be fixed with a small modification to the document,
-# but note that XeTeX exports without error (with the current document).
-# This assertion was reported on the LuaTeX ML here:
-# https://www.mail-archive.com/search?l=mid&q=20201030030430.4y4i6bdpwx633qs7%40vbox-VirtualBox
-# The assertion will be converted into the following error as of LuaTeX svn commit r7385:
-# ! the word doesn't start with a character
-export/doc/he/Tutorial_(dvi3|pdf5)_systemF
# Ukrainian