Villager stops being cured

What I expected to happen was...:
The zombie village to be cured

What actually happened was...:
The zombie villager stopped being cured and needed to be splashed with a potion and given a golden apple again because the chunks were unloaded.

Steps to Reproduce:
1. Start curing a villager to the point it starts shaking.
2. Leave the chunks so that they arent loaded (I went through the nether and loaded a new area that was 1000's of blocks away).
3. Go back to the villager(s) that's being cured and you will see that the shaking and particles have stopped but its still a zombie villager.