I would like to know which world tasks are new. There was 16 tasks, but now it shows that they are 20. What are 4 new tasks? In travian answers I found only known 16.
It seems like you are correct and from my experience there are no quests after training 3 settlers and finding a new village.
I havent seen any recent update or changeligs that increased the number of world quests, so probably its a bug.
No tasks after founding new village, so yes, it´s bug.