For the Yor the tech Economic Efficiency is missing the icon/tool-tip for the Efficiency center
Also it dosnt unlock the Efficiency center as it says its supposed to. At least i think it dosnt, my market centers have no upgrade option and there is nothing of that name in the build options.
Edit:
Also noticed a problem in the Yor tree with Tariff Stations.
Description suggests a income boost but it lists +10% Research. I'm guessing it should be +10% trade income. Or the research is correct and the description is wrong