Pigs/Striders can be pushed through walls allowing the player to ride them through blocks

It's possible to push/walk pigs and striders through walls in negative x and negative z-direction making you able to go through walls.

Steps to reproduce:

1. Find/make a wall

2. Summon a pig and give it a saddle

3. Go to the right side of the wall so when you look at the wall you look in a negative direction (This is the side you are going to go through)

4. Ride the pig close to the wall and make sure the pig's hitbox isn't against the wall

5. Step of the pig and push it against the wall

6. Go onto the pig again and try to walk against the wall using a carrot on a stick. If you did it correctly your screen will go back and forth when trying to go into the wall. (If it doesn't happen, go back to step 4 and try again)

7. Step of the pig, this time push the pig deeper into the wall. The pig is now in the wall

8. Go onto the pig and ride through the wall.

The steps for reproducing it with a strider is the exact same as doing it with a pig. (Of course you have to use a Warped Fungus on a Stick instead of a Carrot on a Stick when doing it with a strider)

Video of me doing it: https://www.youtube.com/watch?v=ujFKYqoAzZE