Trouble with Zombie Villagers

[Bearfish]

So I have converted or cured three zombie villagers now only to have them vaporize while I am off doing other things.  Has anyone else done this and had this problem?  I can't get the second villager to have the two make little kids because the first one vanishes.  Any suggestions as to what to do?  It is very sad to build a village with no villagers...

[FNVcourierjon(SigilStone)]

When you cure them it takes awhile for them to transform (notice the shaking).  When they turn back into a villager they won't disappear when you go away.  So don't warp to another home if it hasn't transformed into a villager.

[Roza]

Also that happens if you are using Zombie villagers from a spawner.

[andersad]

Also that happens if you are using Zombie villagers from a spawner.

I had that problem before, it was because 8 was using a spawner.