In my server my friends and I found a spruce village next to a mountain. We caused an illager raid and defended the village until we killed all of the illagers. There were still 15 villagers left but in the course of 4 Minecraft days, they all started to disappear except for 2 villagers who lived on the mountain,. A week later we cured a villager and put him in our manmade village, and blocked him in a house so that we could get a wall around the village. We had jobsites, beds, and a bell but even then the villager that we cured disappeared as well.