Chamber of Commerce skip 1 tech for traders


I noticed that if you research all 3 dark age eco techs, you only get 2 traders by reaching feudal. It seems to be that the first tech doesnet count (doesent matter which one). So, 1 tech = 0 trader, 2 techs = 1 trader and all 3 techs = 2 traders.
If you do the 3 dark age eco tech while you already have the ### up (in feudal) you get the 3 traders accordingly.

I just tested it with Jeanne d’Arc but I guess it will be the same for French.