scafolding corner bug!

Put the summary of the bug you're having here

What I expected to happen was...:

 ** use the scafolding block!  

What actually happened was...:
when i went in corner of scafolding block, it wasnt functioning properly

Steps to Reproduce:
1. go to the very corner of the scafolding block
2. press shift when at the top of scafolding 
3. upon landing you take fall dammage as if u were falling

Or watch the video: https://youtu.be/448yNaaUins (Couldnt upload because it was too big)