Zombie Villagers are able to be splashed with Weakness, and they then accept the Golden Apple and start shaking indicating they have started the curing process. However, after several minutes, they stop shaking and stop giving of particles but stay as a zombie.
In the images I have attached, I cured all three villagers from zombie, but none of them actually got cured. This has happened multiple times now, with about 5 or 6 different villagers.
Attachments
Comments 4
They did get cured, but were attacked by the nearby zombie villagers that weren't cured, so they all turned back into zombies.
At least that's what I think; curing multiple zombie villagers in the same space is not a good idea because the zombie villagers that aren't cured yet can attack the villagers.
I did not unload the chunks at all whilst curing them. Unless they were zombified by a neighbouring zombie villager immediately, they were not attacked by other zombie villagers.
Were you in the same area the whole time, or did you unload the chunks for a moment?