If you extend a sticky Piston with a slimeblock at the front and then stand on a halfslab under the extended part of the piston and deactivate it, you get teleported behind the Piston.

What I expected to happen was...:
I expected that I would get pushed down

What actually happened was...:
i got teleported behind the Piston

Steps to Reproduce:
1. Place a slab on the ground
2. Place a Piston on top of it, but leave 1 block of space
3. Put 1 slimeblock at the front of the Piston

4.Power the Piston and go under the Extended part of the Piston so you are standing where the slimeblock was and on the slab

5.Unpower the Piston