The bug
Skeleton horse and undead horse that have been spawned from a spawn egg cannot be interacted with in any way.
Expected behavior
Spawning a skeleton horse from a skeleton horse spawn egg will spawn a tamed skeleton horse that you can ride on, open its inventory, put a saddle on it and feed it or an untamed skeleton horse that can be tamed by riding it.
Spawning an undead horse from an undead horse spawn egg will spawn a tamed undead horse that you can ride on, open its inventory, put a saddle on it and feed it or an untamed undead horse that can be tamed by riding it.
What happens
A skeleton horse that spawned from a skeleton horse spawn egg cannot be ridden on, open its inventory, put a saddle on it, be tamed, feed it.
An undead horse that spawned from an undead horse spawn egg cannot be ridden on, open its inventory, put a saddle on it, be tamed, feed it.
Steps to reproduce
Go in creative
Spawn a Skeleton/Zombie Horse
Try to ride it
Linked issues
is duplicated by
Comments
Can confirm too
Removed the spawn eggs for now.
Confirmed for snapshot 16w40a.
The bug still exists.
Confirmed for 1.11pre-1
*I feel the " steps " are a bit alot ... That is not like no one didn't know how to open his eventory lol.
Must be:
Steps to reproduce:
#1 Go in creative [GM 1]
#2 Spawn a Skeleton/Zombie Horse
#3 Now try to ride it...
Updated description, thanks.
I just had this problem in Java 1.13.1. First they were freezing my game, now I can't ride them. I was spawning them from eggs, in a group of four (since there's four people on the server). Hope this gets fixed soon or that pat of my Halloween plan is kaput!

The bug has not yet been fixed!
1.14.3 bug still exist
Rideable skeleton horse can be spawned with `summon minecraft:skeleton_horse ~ ~ ~ {Tame:1}`

The bug still exists in snapshot 19w38

Affects 1.16 pre-release 7, I would like to request ownership of this ticket so I can continue to update it.
This bug still exists in Minecraft 1.16.1
Can confirm in 20w48a.
Can confirm in 21w03a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 21w07a.
Can confirm in 21w11a.
Can confirm in 21w13a.
Can confirm in 1.17.
Can confirm in 1.17.1.
Can confirm in 1.18.2.
Can confirm in 1.19.
Can confirm in 1.19.2.
According to MC-259463, this got fixed.

This bug also exists if you use summon command (not the trap one).
/summon ~ ~ ~ minecraft:skeleton horse
Can confirm.