Items thrown at the side of a Honey block will keep their horizontal trajectory despite slower speed

This bug affects only dropped items and not people, mobs or Armour stands. It was discovered by Mumbo Jumbo in a Honey Block testing video: https://youtu.be/SLqwJ2tmYNE?t=131

Please see the attachments below for a visual.

If you are facing a honey block and thrown a item at it directly, it will slow down from the normal drop speed and fall down the block to the bottom. 

However, if you align yourself to the side of the honey block and look across the face, you will see that throwing a block means it continues on a normal horizontal trajectory despite it being slowed down. 

It should glide across the face of the block, slow down, and then fall vertically down the face. This does not happen.