Untamed zombie horses and skeleton horses cannot have saddles placed on their saddle slot using /item

1. Summon a zombie horse (NoAI:True) (so it doesn’t wander off, probably not actually required)

2. /item replace entity @n[type=zombie_horse] saddle with saddle

   1. Nothing will happen. I expect that a saddle will be placed on the horse.

3. /data modify entity @n[type=zombie_horse] equipment set value {saddle: {id:saddle}}

   1. A saddle will be on the zombie horse

I expect both these commands to work the same. I also have noticed that

• /item replace entity @n[type=zombie_horse] saddle with air

will remove the saddle from the zombie horse, even though the command can’t put a saddle on it

You can repeat all this with a skeleton horse instead of a zombie horse with the same problem.