So I’ve decided to focus my first few games on the Delhi Sultanate and have been achieve the first mastery, which is to increase the yield of 6 berry bushes. This is accomplished by building a mill next to said bushes, however it does not seem to work, as I’ve yet to get the mastery. Do I have to win said game or do something else to get the mastery to register or is it just a bug.
I think you have to finish the game conventionally. I seem to recall exiting a game (I was losing badly) having completed a mastery and did not receive credit. AFAIK mastery credit occurs on the end-of-game score screen.
Just to double-check, are you sure the mill covered all 6 berry bushes? It has to have the little fencing around them.