Villages don't upgrade to 1.14 villages

The issue I am having is that in my Peaceful Survival World, I have a pre-existing village that I had in 1.13.2. When I played Pre-release 5, the look of the village stayed the same from 1.13.2, with the new 1.14 block textures being the only difference.
If this is not a bug, the look of pre-existing villages should change with the new update.