I seem to be experiencing the same issue. I found a large, spread out village with half in a plains biome and half in a desert. with a large, steep hill in the middle. I made my house on the plains side because who wouldn't. All of the villagers on the plains side are gone, and only two remain on the desert side. All the plains villagers disappeared at once, and I assumed they had been killed. The desert side had a few villagers left, I think 4, but they were acting strange. They would not stay near the houses ever. They only stayed out on the area just outside of the houses. Slowly, though, those have disappeared often. They should be in rendering distance being just longer than an ender pearl throw away, and I can see the houses and such from my own house, yet it seems every few times I head over another has disappeared. Any help would be nice, as it is getting the point where I am getting frustrated that I can't do anything with villagers (one of my favorite parts), and I am slightly scared of trying to do more with villagers as they might disappear. This is on a newish Windows 10 machine with 1.14.4. I don't know how to do a world upload, but if you want I can try that. Also this is a personal single player world.
Jonah Goff
I seem to be experiencing the same issue. I found a large, spread out village with half in a plains biome and half in a desert. with a large, steep hill in the middle. I made my house on the plains side because who wouldn't. All of the villagers on the plains side are gone, and only two remain on the desert side. All the plains villagers disappeared at once, and I assumed they had been killed. The desert side had a few villagers left, I think 4, but they were acting strange. They would not stay near the houses ever. They only stayed out on the area just outside of the houses. Slowly, though, those have disappeared often. They should be in rendering distance being just longer than an ender pearl throw away, and I can see the houses and such from my own house, yet it seems every few times I head over another has disappeared. Any help would be nice, as it is getting the point where I am getting frustrated that I can't do anything with villagers (one of my favorite parts), and I am slightly scared of trying to do more with villagers as they might disappear. This is on a newish Windows 10 machine with 1.14.4. I don't know how to do a world upload, but if you want I can try that. Also this is a personal single player world.