It may be a visual bug, but the Ayyubids get a 15% gathering rate bonus from their Golden Age when in anything 2 or higher. I assume this is not intended as they get 10% in the 1st Golden Age in gameplay and theory from the UI. In addition, the research buff from Golden Age 2 isn’t very clear as the Golden Age UI simply says 50% Research Speeds though on buildings the Golden Age buff states that research is increased by 15% which Idk if either is correct as the initial blacksmith researches go from 60s to 40s. Finally, once you reach tiers higher than 3, the UI on things simply says Generating Enhancements for certain things like villagers and blacksmiths. I tested these out in Skirmish vs AI, so I guess it may be only broken there.