Found small glitch on web version. I started to install Generator in Laurion as combined action. Then stopped partway through to leave the rover and grab some food and water. When I returned to the rover, the action showed as partially completed, but when I clicked to start it, it started at the beginning again which I hadn't planned on because of limited resources. I assume it should have continued where it was in progress?
I am assuming that you are talking about the install action from the rover from outside Laurion.
certain location-based actions are only saved while you are still at that location and if you leave the location they reset. In my experience the green ones reset if you leave the location. Also…I’d pull a power cell, power up Laurion, park the rover, and then install the generator instead.