Lignumis tweaks the prerequisites for the worker robot speed techs. In particular, worker-robots-speed-3 no longer depends on worker-robots-speed-2. This technically works, but it makes the tech tree confusing; it looks like worker robot speed techs suddenly stop after the second one and there is no longer infinite robot speed research. It would probably be a good idea to retain that prerequisite.

Hi. I did that because people didn't research everything before leaving Lignumis and then were stuck with those technologies. It's especially painful with the weapon damage technologies.
Sorry, it will stay like this.

Understood. Thanks!