Boat moves on land

I was Live streaming the other night and someone made me aware of a boat glitch, so I put a boat on the land blocks. What I expected to happen was absolutely nothing. I was going to prove them wrong, until I realised I could move the boat on land, something which has never happened before.
How to recreate:
Load any 1.9 world.
Place boat on land blocks
Use the movement keys (wasd)

Other notes:
Boat moves faster on ice and also drifts
A recreation of this was made by me and can be found here: https://youtu.be/GsKo2G8hFzo