Resolution: Works As Intended
Affects Version/s: Minecraft 17w47a, Minecraft 17w48a, Minecraft 17w49a, Minecraft 17w49b, Minecraft 18w01a, Minecraft 18w02a, Minecraft 18w03b, Minecraft 18w05a, Minecraft 18w06a, Minecraft 18w09a, Minecraft 18w10c, Minecraft 18w16a, Minecraft 1.13-pre1
Fix Version/s: None
1. Use a horse spawn egg to spawn a horse
2. Right-click on it with a normal item (horse rejects it)
3. Right-click on it with a creeper spawn egg (horse is mounted)
Applies to any spawn egg, except for the horse spawn egg itself (that will spawn a baby as expected).
Affects horses, donkeys, llamas, etc. Does not affect saddled pigs.