Many thanks for taking the initiative to follow up with SANE developers!
Endless OS is based on Debian and unfortunately it does seem that Debian (which is a community-run project) is a bit behind on packaging this new version.
I have filed an explicit request for the package update based on your feedback. Let’s see if that helps.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=944998