The bug
Llamas and trader llamas need to be tamed in order to be ridden by the mob which is inconsistent with other rideable mobs.
Steps to reproduce
Use the following command:
/summon minecraft:llama ~ ~ ~ {Passengers:[{id:husk}]}
/summon minecraft:trader_llama ~ ~ ~ {Passengers:[{id:husk}]}
/summon minecraft:horse ~ ~ ~ {Passengers:[{id:husk}]}
All the rideable mobs that don't need to be tamed:
Horse
Donkey
Mule
Skeleton horse
Zombie horse
Linked issues
relates to 2
Attachments
Comments

Affects 1.19.4.