A villager zombie which has picked up items, when cured will not drop any of the items. They seem to simply disappear unlike in vanilla 1.16.3 where the items will drop.

Reproduction steps:

1. Let a zombie villager with CanPickUpLoot nbt as true pick up items/armor.
2. Cure zombie villager with potion of weakness and golden apple.
3. Wait until zombie villager converts to a villager.

Also reproducible on craftbukkit:

git-Bukkit-890130b (MC: 1.16.3) (Implementing API version 1.16.3-R0.1-SNAPSHOT)