Super Sustainable achievement and ruins

[Kevdog]

My colonies were humming away running on slugs, hydrogen, and solar when I noticed the Super Sustainable achievement was greyed out. I opened it and the box for "Never built a Coal Generator" had a red X, even though I never built a coal generator. I did find one one in some ruins though, and a dupe fed some coal to it before I noticed they were doing it.

I'm not sure whether it was the discovery or burning coal that did it, but having a discovered building spoil an achievement didn't seem right to me. Maybe as a simple fix leave the coal generator disconnected in the ruins?