Summary:
Zoglins, Hoglins and Pandas can still attack players on a camel (even after fixing MC-256655).

Steps to reproduce:

1. Summon and saddle a camel.

   /summon camel ~ ~ ~ {SaddleItem:{id:"minecraft:saddle",Count:1b}}

2. Summon a hoglin.

   /summon hoglin ~ ~ ~ {IsImmuneToZombification:1b,Attributes:[{Name:generic.attack_damage,Base:0.0001}]}

3. Sit on a camel, switch into survival mode, and allow the hoglin to attack you.

Observed results:
Hoglins, Zoglins and Pandas can attack the player on a camel.

Expected results:
Hoglins, Zoglins and Pandas cannot attack the player on a camel.

Screenshots: