The tech has been unresearched in versions 1.0.10 and 1.0.11, I'm currently running 1.0.9 on my save
Upon updating the mod and loading the save, the warning window will appear that the content has been migrated. It's still in the game, can be found on the tech tree, but must be researched again

Oops. That is likely because I renamed the research because of a typo (effecient instead of efficient). I could probably revert the name of if but keep the language file changed if you'd like me to.

It's fine by me as it since 3k research doesn't matter, I mostly reported this fearing that it might happen with every new version, that would've been annoying
Although people who have this mod and are playing in expensive mode and already researched it, might have a different perspective, if there are any

It might be better to create a quick Migration script, so the game knows when you rename something.
see here https://lua-api.factorio.com/latest/auxiliary/migrations.html
Very useful when spelling mistakes get you down :P

though, as UPD-8 alluded to, its only 3K research. by the time your at this point, thats not exactly a stress on most bases production.

Yeah, fair enough. I'll still attempt using the migration utility just so I can figure out how it works.