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When zombie villagers, husks, drowned or zombified piglins take damage, there is a chance (depending on difficulty setting it seems) that a zombie will spawn.
It is not clear what the expected behavior for these zombie types should be: Spawning zombies of the same type or not being able to spawn reinforcements at all.
However, for zombie villagers spawning zombie villager reinforcements might allow building a farm based on this, which might or might not be desired.
Note: For zombified piglins ("zombie pigmen" at the time) this was partially fixed in 20w14a by setting their base zombie.spawn_reinforcements value to 0. However, it appears that if a zombified piglin spawns as leader ("Leader zombie bonus"), then it is still possible for it to spawn zombies. The same also applies when setting a custom zombie.spawn_reinforcements value in the NBT or via commands.
- Be in the nether or the end (the overworld works too, but there will be natural zombie spawning as well)
- Set the game difficulty to hard, and ensure the gamerule mobGriefing is set to true
- Spawn a bunch of zombie villagers, husks, drowned or zombified piglins. Example:
- Go into survival mode
- Damage the mobs for a while
→ Zombie reinforcements are spawning
Regular zombie reinforcements would not be spawned when entities that aren't zombies with the minecraft:zombie.spawn_reinforcements attribute are attacked. Instead, for example, if a zombified piglin with this attribute were to be attacked, it would summon zombified piglin reinforcements and not zombie reinforcements.