Hi everyone! I am a newbie on 0ad and GNU-Linux but like it very much. I am having the same issue but with the Introductory Tutorial, y complete it but cannot play the next one Economy Walkthrough. After i complete it just appears 'available' and nothing on Economy Walkthrough. Tried a lot of things, installed it via Flatpak, appimage, sudo pacman... Also changing the tutorial json with 'complete': true etc and nothing. I am thinking if having an Nvidia GPU could be a problem...
I would really appreciate some help, really stuck with these, Thanks everyone! Awesome work!