rideable mob x-ray

Can see through solid blocks while riding into stairs at head level with horses/camels/pigs/llamas/donkeys/I assume every other rideable mob

What I expected to happen was...:
I expected to take damage like riding into solid blocks or be able to only to see through the block you´re inside when riding into non solid blocks

What actually happened was...:
I could suddenly see through the solid blocks behind{}

Steps to Reproduce:
1. Place a stair at a wall at head height (one block above the ground for a pig; two blocks for a horse, donkey or other medium mobs; 3 blocks for a camel)
2. tame the mob if necessary
3. place a saddle on the mob
4. ride the mob against the wall so that your head goes inside the stairs
5. use x-ray for easy vision of cave systems (jk)