Cured zombie villagers that weren't previously villagers cannot be traded with

Steps to Reproduce

1. Find a naturally-spawned zombie villager or use /summon to spawn one.
2. Cure it.
3. After it turns into a villager, try to trade with it. You can't due to this bug.

Note that villagers who were able to be traded with, and then converted to a zombie villager and then cured, are NOT affected by this bug.