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Quote from jovialmadness Make sure the zombie is actually a zombie villager and not just some random zombie. They look different... Just in case you didn't know that.
2. Make sure you can clearly interact with the zombie. (nothing in the way)
3. Hope for no lag.
After that there isn't much else to say. Maybe there's some sort of mod or something which is bugging out the process.
Just in case you didn't know that.
I use PureBDCraft texture pack so there is huge difference.