For Byzantines, the “Grand Winery” Landmark acts as a Mill, and have the Food Gather Technology (1/2/3) upgrades. The percentages should be 10% / 10% / 10%.
However, the description has the percentages 15% / 15% / 20%. Image at bottom shows them.
The actual effect of the upgrades work correctly. Only giving 10% each upgrade.
Build: 12.0.1974.0