What I expected to happen was...:
Just get bounced around

What actually happened was...:
After moving and jumping I ended up being clipped in a block. People in survival don't suffocate and you can't unshift after shifting

Steps to Reproduce:

1. Create a 2x3 area with sticky pistons with end rods (maybe it works with fences or walls or something of the kind) on them on as many sides as possible
2. Hook up the pistons to a 3tick repeator
3. Jump in the pit of pistons and try to jump and move until you clip through a block. It can take 30 seconds or more.