Zombified piglins occasionally spawn with broken attributes because of non-existent spawn event

26.0 attempted to fix a bug where some zombie variants fail to form chicken jockeys. (MCPE-223845). However, zombified piglins were not actually fixed and were only made worse since that update. 0.75% of zombified piglins that spawn are supposed to be baby jockeys that find mounts like how baby zombies do, however they actually spawn as a broken zombified piglin that is neither an adult nor a baby, with the following broken attributes.

• They cannot be affected by Smite.

• They aren’t attacked by iron golems or snow golems.

• They can be affected with Poison and Regeneration effects.

• Piglins and armadillos aren’t scared of them.

• They don’t drop xp upon death.

• They cannot ride anything. (See MCPE-236034).

This happens because these broken

There are multiple ways to reproduce the issue.

Steps to reproduce:

1. Place two repeating command blocks down, not touching each other.

2. Type /summon zombie_pigman in one, and name the command block 'Summoner'.

3. Type /kill @e[type=zombie_pigman,family=mob] in the other, and name it 'Killer'. Note: It has to have family=mob, otherwise the issue cannot be reproduced.

4. Place levers on the two command blocks.

5. Flick the 'Killer' lever first, then flick the 'Summoner' lever next.

Expected results:

• No zombified piglins survive.

Actual results:

• A few zombified piglins survive, those being the broken ones.

Additional notes:

• This happens because of a non-existent spawn event in zombie_pigman.json, by the name of spawn_baby_jockey. Because it doesn’t exist, no component groups are added.

• minecraft:type_family is actually required for mobs to be able to ride anything.

The fixes:

• Remove the minecraft:experience_reward component from minecraft:pig_zombie_baby and minecraft:pig_zombie_adult component groups and add to the base components part like this:

  "minecraft:experience_reward": {
    "on_death": "query.last_hit_by_player ? (query.is_baby ? 12 : 5) + (Math.die_roll(query.equipment_count,1,3)) : 0"
  }

• Add the minecraft:type_family component back into the base components part like this:

  "minecraft:type_family": {
    "family": [
      "zombie_pigman",
      "undead",
      "monster",
      "mob"
    ]
  }

• Add the non-existent spawn_baby_jockey event like this:

  "spawn_baby_jockey": {
    "add": {
       "component_groups": [
          "minecraft:pig_zombie_baby",
          "minecraft:pig_zombie_jockey",
          "minecraft:pig_zombie_calm"
       ]
    }
  }