I have uploaded the fix to GreasyFork: Advanced Context Sentence 2.
I think I would prefer it if @abdullahalt or one of the @Mods edits the installation link in the first post of this thread to something like this:
Installation
Hope you enjoy it![outdated version]
New version maintained by @Sinyaven
If there are multiple [Userscript] Advanced Context Sentence threads, people searching for this script have a harder time finding out which version they should install. And if @abdullahalt returns and wants to continue supporting this script, they just have to change back the installation link in their post.