Falling block dropped on any boat will float above this boat in a 3x3 grid and never land

In the latest snapshot (16w06a) drop an anvil/sand or any other falling_block entity from a few blocks high on a boat. It doesn't break, but the falling_block entity glitches and never lands.

Reproduce:

• place a boat on solid blocks.
• in a 1 block radius (the block below the boat and the ones touching it + diagonals) any falling_block entity dropped on top of the boat in that grid will float in the air and never land.
• you can stack up as many falling_block entities as you want in a single blockspace
• when you destroy the boat, the blocks drop as items (if the Life tag hasn't overflown yet).