The bug

If a warden gets angry at a villager, and said villager transforms into a zombie villager before the warden can kill it, the warden will not remain angry at this zombie villager and will need to become aggressive toward it a second time.

How to reproduce

1. Use Hard difficulty
2. Create an enclosure protected by sunlight
3. Spawn a villager inside
4. Throw a Poison II splash potion at the villager
5. Once the villager has been damaged 10 times, summon a warden
6. Once the warden roars at the villager, spawn a zombie next to the villager

Expected results

The warden would remain angry even when the targeted villager becomes a zombie villager.

Actual results

It loses its target.