I had found this when experimenting with camels, but it also applies to horses. If you were to place a saddled horse or saddled camel spawner, the little camel or horse in the spawner doesn't have a saddle on it. I would expect it to render the saddle because the mob that spawns has a saddle on it and the mob in the spawner is meant to mimic exactly what spawns out of it, and this is the only case where that isn't true. Another reason as to why this seems inconsistent is because saddled pig and saddled strider spawners work like how I described, showing the saddle on the mob in the spawner.

To replicate this behavior, use one of the following commands to give yourself a saddled horse or saddled camel spawner to place down. Make sure to put a grass block near the spawner otherwise they won't spawn at all. At first it may look like a pig spawner, but once a mob spawns, it will show the respective mimic of the mob that it spawns. Also you can relog and the spawner will show the mob inside as well.

• Saddled Horse

/give @p command_block{BlockEntityTag:{auto:1,Command:"/setblock ~ ~0 ~ minecraft:spawner{SpawnData:{entity:{id:horse,SaddleItem:{id:saddle,Count:1}}}} replace"},display:{Name:'[

{"text":"Horse Spawner","italic":false}

]'}}

• Saddled Camel

/give @p command_block{BlockEntityTag:{auto:1,Command:"/setblock ~ ~0 ~ minecraft:spawner{SpawnData:{entity:{id:camel,SaddleItem:{id:saddle,Count:1}}}} replace"},display:{Name:'[

{"text":"Camel Spawner","italic":false}

]'}}

Now you can see that the mob spawner doesn't seem to mimic the saddle on the mob that spawns from it. You can use the following commands to give yourself a saddled pig or saddled strider spawner to see how I would expect the spawners to mimic the saddled mob.

• Saddled Pig

/give @p command_block{BlockEntityTag:{auto:1,Command:"/setblock ~ ~0 ~ minecraft:spawner{SpawnData:{entity:

{id:pig,Saddle:1b}

}} replace"},display:{Name:'[

{"text":"Saddled Pig Spawner","italic":false}

]'}}

• Saddled Strider

/give @p command_block{BlockEntityTag:{auto:1,Command:"/setblock ~ ~0 ~ minecraft:spawner{SpawnData:{entity:

{id:strider,Saddle:1b}

}} replace"},display:{Name:'[

{"text":"Saddled Strider Spawner","italic":false}

]'}}