If standing on wooden fence and put a pressure plate on top (optional) it doesn't activate because your too high above the fence

How to reproduce:

Get a wood fence and pressure plate(optional).

Place fence down and place optional pressure plate on.

Goto f5 mode (change view) and you will see you are a block and Slab(almost) on the fence

 

Expected Results:

Pressure plate should be pressed and you should not be so high above the fence

 

What happeneds:

You float a slab above it