Non-full blocks can be pushed by pistons

I was randomly playing on my creative world, until i found that slabs placed upwards could be pushed by pistons. That doesn't make any sense!

Expected Result

Slab or non-full block should be broken/or not pushed by the piston

Actual Result

Slab or non-full block gets pushed

How to do it

​1. Place a piston pointing up

1. Place a slime/honey block on top of it

2. Place a slab pointing up/shelf pointing in the opposite direction like in the videos

3. Activate the piston to see the bug

Also, please watch the videos, so you can understand how to do the bug