Halloween Event Perks - Not completing/working

I started a new single player map to get the first perk by completing the mission “Research Crop Rotation in the Mill”. I did not use any cheats, played a normal game with 3 other AI players and after winning the map I still find the “Research Crop Roration” as incomplete. Am I missing something here?

Any suggestion is appreciated.

If you researched Crop Rotation tech, then it should’ve worked. It worked for me…